M4maths Previous Puzzles

08 Apr 2015 Time and work

3 men and 4 women do a work in 10 days as 2 men and 6 women do. 4 men and 8 women starts the same work and after 2 days only women remains in the work for completing it. How many days are required to complete the work.

OPtion

1) 6
2) 7.5
3) 8
4) 8.5
5) 9
6) 10.5
7) 11
8) 12
9) 12.5
10)13

Solution

3 men + 4 women = 2 men + 6 women
1 men = 2 women
Now 4 men + 8 women = 16 women
according to given condition
3 men + 4 women = 10 women do the work in 10 days
So 1 day work of 1 women = 1/100 part
In 2 days work completed = 2*16* 1/100
= 32/100 part
Remaining work = 68/100 part
and Remaining women for work = 8
So number of days required = (68/100)/(8/100) = 68/8 = 17/2
= 8.5
Option 4)

Correct Option: 4 Best Solution (23)

moumita   9 years AGO

3m+4w=2m+6w => 1m=2w
3m & 4w does the work in 10 days.
=> 10 women does the work in 10days.
now, 4men & 8women will do the work in = 4*2+8 = 16 women
16 * x= 100 days => x= 6.25 days
1 women 1 day work = 1/100
16 women 2 day work =2/6.25
remaining days= 1-(2/6.25) = 4.25/6.25 = 0.68
now after 2 days all men left. so, 8 women are left to do the remaining work.
8 women 1 day work = 8/100
then no of days= 100/8 = 12.5
now, total no of days = 12.5 * 0.68 = 8.5 days
Ans= (4) 8.5

Like? Yes (6) | No (2)  

Supriya Mondal   9 years AGO

1 man do the work in 1 day is =1/50 part of the work
and 1 woman do the work in 1 day is =1/100 part of the work
So, in 2 days they will done (8/50+16/100)=16/50 part of the work
So the days needed by the women to complete the rest of the work will be=(1-16/50)/(8/100)=8.5 days
So, option 4)8.5 is the right answer

Like? Yes (3) | No (1)  

ABHINAV PUSHPAM   9 years AGO

(3 men work + 4 women work ) 10 days = (2 men work + 6 women work ) 10 days 3 men + 4 women = 2 men + 6 women
1 men = 2 women So, total work in case of women is
(3*2 + 4) * 10 = 100 women work. Thus
( 4*2 + 8 ) * 2 = 32 women work is completed after 2 days. Remaining 68 work is done with 68/8 = 8.5 days by women..... 8.5 days is the answer..!

Like? Yes (2) | No   

sompon temtheerakij   9 years AGO

3 man + 4 woman = 2 man + 6 woman
so 1 man = 2 woman
5 man do in 10 day = 1/50 work/day
10 womwn do in 10 day = 1/100 work/day
4 man + 8 woman work 2 day = 2(4/50 + 8/100) = 8/25 work
remain work = 1 - 8/25 = 17/25
8 woman do 17/25 work = 17/25*100/8 = 8.5 day

Like? Yes (1) | No   

umesh   9 years AGO

30md+40wd=20md+60wd
1m=2w
for 2 day they will work 32women days
100-32=68wd
so after 2 days only women will do work in=68/8
so opion 4 is correct

Like? Yes (1) | No   

Devendra Marghade   9 years AGO

3M+4W=2M+6W, M=2W
So 3M+4W=10W's 1 day work=1/10,
So 1W, 1Day work=1/100
Now 4M+8W=16W's 2 days work=(16*2)/100=8/25
So work left=17/25, which is to be done by 8 women,
Days required=Remaining work/ 8 women's 1 day work
=(17/25)/(8/100)=68/8=8.5
Ans=option 4)

Like? Yes (2) | No (1)  

kranthi kanchanapally   9 years AGO

form the given problem we get the equations
30m+40w=1.....(1)
20m+60w=1....(2)
we get m=50 and w=100
then 4 men and 8 women will complete the work in 1 day=16/100
the men and women worked for 2 days=32/100
then remaining work 68/100 work done by 8 women in 8.5 days
so option 4 is correct

Like? Yes (1) | No   

Shonit Baradia   9 years AGO

Calculate the amount of work each man and woman does per day
Also notice that men are twice as much productive as women
Then we get 1 man = 2 women
Then we see that each man does 2% of the work per day
For first 2 days we have 8 men doing 32% of the work
For the rest of the work, i.e., 68% it will take 8.5 days
Therefore 10.5 days

Like? Yes (1) | No   

Sunny Raj Sahil   9 years AGO

Each man works as double of each woman, so if only women starts working then 10 women takes 10 days means, a single woman will take 100 days to complete that work.

now 4 men and 8 women which is equal to 16 women, work for 2 days means 16*2=32 part of work has been done out of 100

now remaining work is 100-32=68

if only women work then 8 women will work for 8 days and another half day, that means 8.5 days and the option will be 4

Like? Yes (2) | No (1)  

Math Lovers   9 years AGO

3m + 4 w = 2m + 6w
=> m = 2w

So, 3m+4w = 10 w finish 1 work in 10 days
=> 1 w finish 1 work in 100 days
4m + 8w = 16 w
work done by 16 w in 2 days = (1/100) * 16*2 = 32/100
rest work = 1- 32/100 = 68/100

for rest work -
1 work 1w = 100 days
1 work 8w = 100/8 days
68/100 work 8w = (100/8)* (68/100) = 8.5 days

Like? Yes (1) | No   

Utkarsh Sharma   9 years AGO

(3 men work + 4 women work ) 10 days = (2 men work + 6 women work ) 10 days
3 men + 4 women = 2 men + 6 women
1 men = 2 women

So, total work in case of women is
(3*2 + 4) * 10 = 100 women work.

Thus
( 4*2 + 8 ) * 2 = 32 women work is completed after 2 days. Remaining 68 work is done with 68/8 = 8.5 days by women.....

8.5 days is the answer..!

Like? Yes (1) | No   

aman aditya   9 years AGO

1 man = 2 women

total work = 100 women
so in two days 2*4*2+8*2=32 part is done
100-32=68 part is left
68/8=8.5

Like? Yes (1) | No   

vishwa   9 years AGO

work done by 1 men = 1/50
work done by 1 women = 1/100

on solving,8 1/2 days are more required

Like? Yes (1) | No   

sourav pal   9 years AGO

(3 men work + 4 women work ) 10 days = (2 men work + 6 women work ) 10 days

3 men + 4 women = 2 men + 6 women
1 men = 2 women

So, total work in case of women is
(3*2 + 4) * 10 = 100 women work.

Thus
( 4*2 + 8 ) * 2 = 32 women work is completed after 2 days. Remaining 68 work is done with 68/8 = 8.5 days by women.....

8.5 days is the answer..!

Like? Yes (1) | No   

sachin   9 years AGO

3 men work + 4 women work ) 10 days = (2 men work + 6 women work ) 10 days
3 men + 4 women = 2 men + 6 women
1 men = 2 women

So, total work in case of women is
(3*2 + 4) * 10 = 100 women work.

Thus
( 4*2 + 8 ) * 2 = 32 women work is completed after 2 days. Remaining 68 work is done with 68/8 = 8.5 days by women.....

8.5 days is the answer

Like? Yes (1) | No   

subhankar thakur   9 years AGO

10-1.5 =8.5

Like? Yes (1) | No   

sai   9 years AGO

1 man = 2 women
M*D/w= M8D/w

Like? Yes (1) | No   

RAKESH   9 years AGO

M = 2W

16*2 + 8*X = 10*10
or, X = 8.5

Like? Yes (1) | No   

SHAHEEN   9 years AGO

by given conditions
1 men =2 women
1women=1/100
1 men =1/50
by claculations
8 womens complete in 8.5 days

Like? Yes (1) | No   

alety kiranmai   9 years AGO

by given conditions
1 men =2 women
1women=1/100
1 men =1/50
by claculations
8 womens complete in 8.5 days

Like? Yes (1) | No   

SANTOSH SAHOO   9 years AGO

option 4 is correct answar

Like? Yes (1) | No   

Surit Datta   9 years AGO

(3 men work + 4 women work ) 10 days = (2 men work + 6 women work ) 10 days 3 men + 4 women = 2 men + 6 women
1 men = 2 women So, total work in case of women is
(3*2 + 4) * 10 = 100 women work. Thus
( 4*2 + 8 ) * 2 = 32 women work is completed after 2 days. Remaining 68 work is done with 68/8 = 8.5 days by women
8.5 days is the answer..!
So option 4
that's it.

Like? Yes (1) | No   

Srinivas   9 years AGO

1w one days work =1/100
1 men one day work = 2/100
so ans is 8.5

Like? Yes (1) | No (1)  

07 Apr 2015 Addition, subtraction, multiplication and division

17 + 15 - 14 * 12 / 6 = ?
If +, -, *, / are the notation for subtraction, multiplication, division & addition respectively.

OPtion

1) 2
2) 3
3) 3.5
4) 4
5) 4.5
6) 5
7) 5.5
8) 6
9) 6.5
10)7.5

Solution

According to given condition
17 - 15 * 14 / 12 + 6
17 - (15*14)/12 + 6
= 17 - 17.5 + 6
= 5.5

Option 7)

Correct Option: 7 Best Solution (35)

Supriya Mondal   9 years AGO

From the question we can write,
17-15*14/12+6
=17-17.5+6
=5.5
So, option 7)5.5 is the right answer

Like? Yes (6) | No (1)  

RAKESH   9 years AGO

17 + 15 - 14 * 12 / 6
=17 - 15 * 14 / 12 + 6
= 5.5

Like? Yes (2) | No   

Samyak   9 years AGO

17-15*14/12+6
so it is 5.5

Like? Yes (2) | No   

sonal   9 years AGO

17-15*14/12+6
17-17.5+6
5.5

Like? Yes (2) | No   

Shintala Divya   9 years AGO

acc. to question...
17-15*14/12+6=17-15*7/6+6=17-5*7/2+6
=(34-35+12)/2=11/2=5.5

Like? Yes (2) | No   

MRITUNJAY   9 years AGO

follow the properties of BODMAS

17-15*14/12+6
17-17.5+6
5.5

Like? Yes (2) | No   

praveen kumar   9 years AGO

7 is right ans

Like? Yes (1) | No   

APPIKONDA SANTOSH NAIDU   9 years AGO

7

Like? Yes (1) | No   

SANTOSH SAHOO   9 years AGO

option 7 is correct

Like? Yes (1) | No   

BHASKAR MANDAL   9 years AGO

answer will be 5.5

Like? Yes (1) | No   

Meenakshi   9 years AGO

17 + 15 - 14 * 12 / 6 = ?

+ means subtraction
- means multiplication
* means division
/ means addition

=17-15*14/12+6
by simplifying this ans is 5.5

Like? Yes (1) | No   

GIRISH TYAGI   9 years AGO

simple no need to solve it.. use BODMAS

Like? Yes (1) | No   

NESAB JAFAR   9 years AGO

repalacing

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kranthi kanchanapally   9 years AGO

17-15*14/12+6=5.5
option 7 is correct

Like? Yes (1) | No   

neha   9 years AGO

17-15*14/12+6
so accorsing to bodmas
17-(15*14)/12+6
17-(210/12)+6
17-(70/4)+6
17-17.5+6=-0.5+6=5.5

Like? Yes (1) | No   

shabana banu shaik   9 years AGO

by using bodmas rule and solving we get it as 5.5

Like? Yes (1) | No   

SUSHANT KUMAR   9 years AGO

17+15-14*12/6
after changing notations, we get
17-15*14/12+6
17-15*1.66+6
17-17.5+6
23-17.5
5.5

Like? Yes (1) | No   

arun m d   9 years AGO

17-15*14/12+6=5.5

Like? Yes (1) | No   

shivnath banerjee   9 years AGO

after adding,subtracting,multiplying and dividing all the numbers we get answer is 4 as,
17+15-14*12/6
=17-15*14/12+6
=23-17.5
=5.5

Like? Yes (1) | No   

Surit Datta   9 years AGO

Calculate the result using the operator.
get the answer 5.5
Option 7
that's it.

Like? Yes (1) | No   

Kunal Mehandiratta   9 years AGO

17-15*14/12+6

Like? Yes (1) | No   

Sasikumar   9 years AGO

Solution:

17 - (15*14)/12 + 6 = 5.5

Like? Yes (1) | No   

Jitendra Prasad   9 years AGO

17-15*14/12+6=5.5

Like? Yes (1) | No   

Jaspalsingh Parmar   9 years AGO

using bodmas rule
we get answer as 5.5

Like? Yes (1) | No   

Jay parmar   9 years AGO

using bodmas rule
option 4 is correct

Like? Yes (1) | No   

PRASHANT KUMAR   9 years AGO

23-70/4=5.5

Like? Yes (1) | No   

Subrata Sadhukhan   9 years AGO

after changing sign
17-15*14/12+6
=5.5

Like? Yes (1) | No   

SAKTHEESVARI S   9 years AGO

according to the condition given,question become,
17-15*14/12+6=17-(15*14/12)+6;
=17-(35/2)+6;
=17-17.5+6;
=23-17.5;
=5.5

Like? Yes (1) | No   

nishi   9 years AGO

17-15*14/12+6
17-17.5+6
-0.5+6
5.5

Like? Yes (1) | No   

Bharat   9 years AGO

Eq. becomes :17-15*14/12+6
Use BODMAS Rule:
17-(15*14/12)+6 => 17-35/2+6 =>11/2 =5.5

Like? Yes (1) | No   

ANUJ KUMAR   9 years AGO

17-15×14/12+6
Using BODMAS
Ans=5.5

Like? Yes (1) | No   

b.subbarao   9 years AGO

17-15*14/12+6=17-210/12+6
17-35/2+6
(34-35+12)/2=5.5
so option 7 is correct

Like? Yes (1) | No   

Abhishek birkh   9 years AGO

17-15*14/12+6=5.5

Like? Yes (1) | No   

Shailendra Kumar   9 years AGO

bcz +, -, *, / are the notation for subtraction, multiplication, division & addition respectivly

Like? Yes (1) | No   

Oindrila Dinda   9 years AGO

First start from divison then multiplcation then substraction then addition .then replace the signs with given ones

Like? Yes (1) | No   

06 Apr 2015 Alphabet problem

If SDTW = HWGD
Then BWYT = ?

OPtion

1) XJCQ
2) YJBP
3) XKCQ
4) XJBP
5) XKCP
6) YJCQ
7) YIBQ
8) YJCR
9) XKDQ
10)YICP

Solution

Every alphabet has a numbering from start. Convert this alphabet into a new alphabet from end.
For example
S is 19th from first so will be converted to H which is 19th from last.

Option 7)

Correct Option: 7 Best Solution (16)

abhinav upadhyay   9 years AGO

s h
d w
t g
wd
hence answer is YDBG
all options are wrong...

Like? Yes (8) | No (1)  

JANARTHANAN RAM   9 years AGO

S,D,T,W are 19nd, 4th, 20st, 23th letters from the beginning of the English alphabet respectively. The letters of the code H,W,G,D are respectively the 19nd, 4th, 20st, 23th letters from the end of the English alphabet.so BWYT=2 23 24 20 from the 1st..In reverse we get YDBG

Like? Yes (7) | No (1)  

KUMAR HARSH   9 years AGO

SDTW = HWGD
BWYT =YIBQ

Like? Yes (3) | No   

PRASHANT KUMAR   9 years AGO

position from A(rightward)=position from Z (leftward)

Like? Yes (3) | No   

MRITUNJAY   9 years AGO

this is answer

Like? Yes (3) | No   

Supriya Mondal   9 years AGO

After calculation we get the answer YIBQ
So, option 7)YIBQ is the right answer

Like? Yes (3) | No (1)  

Jay parmar   9 years AGO

option 7 is correct

Like? Yes (3) | No (1)  

sandeep ramchandra pawaskar   9 years AGO

option 7 is correct

Like? Yes (3) | No (1)  

Surit Datta   9 years AGO

If SDTW = HWGD
then BWYT would be YIBQ
so option 7
that's it.

Like? Yes (4) | No (3)  

Jaspalsingh Parmar   9 years AGO

the alphabet gets interchange
so its only seen in option 7
so option 7 is correct

Like? Yes (2) | No (1)  

SUSHANT KUMAR   9 years AGO

SDTW = HWGD
S=H
EQUIDISTANT FROM LAST AND STARTING RESPT.
SIMILLARLY
T=G
EQUDISTANT FROM LAST AND STARTING.
SO
B=Y
AND
Y=B

Like? Yes (2) | No (1)  

Samyak   9 years AGO

Reverse alphabets

Like? Yes (2) | No (1)  

ASHTOSH SINGH   9 years AGO

two words same

Like? Yes (1) | No   

ABHINAV PUSHPAM   9 years AGO

Guess

Like? Yes (3) | No (2)  

syed kashif ullah   9 years AGO

check the differences between alphabets and then solve

Like? Yes (2) | No (1)  

shabana banu shaik   9 years AGO

on counting the alphabet numbers from the beginning and writing the alphabet from reverse order

Like? Yes (1) | No   

03 Apr 2015 Volume and surface areas

A hollow garden roller 63 cm wide with a girth of 440 cm is made of iron 4 cm thick. The volume of the iron used is

OPtion

1) 56372 cm^3
2) 58342 cm^3
3) 58752 cm^3
4) 59354 cm^3
5) 54982 cm^3
6) 52243 cm^3
7) 57636 cm^3
8) 60564 cm^3
9) 56544 cm^3
10)None of these

Solution

Circumference of girth of roller = 440 cm
2*Pi*R = 440 = R (220*7/22) = 70 cm
Outer radius = 70 cm & inner radius = 70-4 cm = 66 cm
Therefore Volume or iron = Pi [(70^2 - 60^2)]*63
= 58752 cm^3

Option 3)

Correct Option: 3 Best Solution (5)

Ankit   9 years AGO

Radius of outer cover=2*pi*r=440
r=70
Inner radius=66(70-4)
Volume of iron=107712

Like? Yes (100) | No (21)  

Anuj Rai   9 years AGO

we know that roller is in the form of cylinder so calculating its volume using pie*r^2*h. on opening the cylinder a rectangle. so on solving it we will get the volume of iron used in it

Like? Yes (20) | No (26)  

Anuj Rai   9 years AGO

as the volume of cylinder is pie*radius^2*height.
put height=63 and calculate the volume of iron used

Like? Yes (10) | No (27)  

Supriya Mondal   9 years AGO

After calculating we get the answer is 58752 cm^3

Like? Yes (18) | No (38)  

SUSHANT KUMAR   9 years AGO

2pi R=440
so R= 70
t=4
h=63
r=66
so volume of iron used= pi*h*[R^2-r^2]
=58752

Like? Yes (15) | No (39)  

02 Apr 2015 Sequence

1 + 3 + 5 + 7 + .......... + x = 12544
s is last term of the sequence.
x will be

OPtion

1) 197
2) 199
3) 205
4) 209
5) 213
6) 217
7) 223
8) 229
9) 231
10)235

Solution

We know that
sum of n odd number starting from 1 = n^2
Sqrt(12544) = 112
So nth odd number = 2(112) - 1 = 223

Option 7)

Correct Option: 7 Best Solution (45)

Surit Datta   9 years AGO

According to the summation series formula,
Sn = n/2*(2*a1 + (n - 1)*d)
where a1 is the first term of the sequence,
d is the common difference,
n is the number of the term to find.
Sn is the total summation,
we get after solving that,
n = 112
so according to the formula,
an = a1 + (n - 1)*d
putting the value of n =112
we get ,
an = 223
so option 7
that's it.

Like? Yes (9) | No (2)  

Sanjoy   9 years AGO

Sum of the series Sn =12544 ,
d= 2, and a is the 1st term
let x is the nth term of the series.
So we know, Sn =n*{2a+(n-1)*d}/2
12544=n*{2*1+(n-1)*2}/2
Or,12544=n*n
Or,n2=12544
Hence,n=112
x= nth term= a+(n-1)d
= 112th term=1+(112-1)*2
=223

Like? Yes (5) | No (2)  

Supriya Mondal   9 years AGO

We know that for A.P series
Sn=n/2[2*a+(n-1)d]
Sn=n/2[a+l]
where, Sn=Sum of n terms
n=number of terms
a=first term of the series
l=last term of the series
d=difference between two terms
Here,
Sn=12544
n=?
a=1
l=?
d=2
Putting this values on the first equation we get n=112
then putting this value on the second equation we get l=223
So, option 7)223 is the right answer

Like? Yes (6) | No (3)  

Anuj Rai   9 years AGO

Using s=(n*(a+l))/2

Like? Yes (5) | No (2)  

Yathiraj   9 years AGO

Sum of N numbers => N^2
Nth number in series => N*2-1 => x in this case
Here is the sum is 12544 = N^2
so, N = 112
x = N*2-1 = 112*2-1 = 223

Option 7.

Like? Yes (5) | No (2)  

s.durgadevi   9 years AGO

sn=n/a[2a+(n-1)d]
sn=12544
n=112
x=n
x=a+(n-1)d
x=223
option 7

Like? Yes (4) | No (1)  

PUJA MUKHERJEE   9 years AGO

n/2*(2+(n-1)*2)=12544
n=112
x=1+(112-1)*2
=223

Like? Yes (3) | No   

saurabh goel   9 years AGO

first calculate sn = n/2(a+l)
where n= 112
then cal x= a +(n-1)d where a=1,d=2,n=112

Like? Yes (2) | No   

sanu kumar verma   9 years AGO

at first we find the sum of infinite series by using formula sn=n/2(2a+(n-1)d.then we get n=112 put this value in this series when first tem and sum of infinite series are known i.e sn=n/2(a+l) and from here we get l=223

Like? Yes (2) | No   

Madhumoy Gope   9 years AGO

If x is the nth term of the series then,
x=1+(n-1)*2
Now,
n*(1+x)/2=12544
or,n*(1+1+(n-1)*2)/2=12544
or,n=112
So,the value of x=1+(112-1)*2=223

Like? Yes (3) | No (1)  

abhinav upadhyay   9 years AGO

n/2 [ 2+(n-1)2 ] = 12544
=> n/2 ( 2n ) = 12544
=> n=112
so , x = 1+ ( 112-1 ) 2
=> x = 223 ans-

Like? Yes (2) | No   

SUSHANT KUMAR   9 years AGO

1+3+5+7+....x=12544
so diff=2
sum=12544
total no of terms=112
hence last term=223

Like? Yes (1) | No   

sompon temtheerakij   9 years AGO

let y = numbers of the sequence
so:- (1+x)y/2 = 12544.....eq.1
(1+x)/2 = y .....eq.2
by solving 2 equation --> x = 223

Like? Yes (1) | No   

ABHINAV PUSHPAM   9 years AGO

Question is wrong. Instead of s, there should be x.
All should get 20 points
Although option 7) is correct.

Like? Yes (2) | No (1)  

vibhu raj gupta   9 years AGO

sum of AP term's=n/2(2a+(n-a)d)
=12544 by solving it
n=112
so series starts from 1
i.e. x=223

Like? Yes (1) | No   

shabana banu shaik   9 years AGO

by substituting in nth term formula and sum of n terms formula i.e a+(n-1)d, n value is (x+1)/2, putting n value in n/2(a+l)..... we get (x+1)^2/4 get (x+1)^2=12544*4=50176, we get 1+x=224, x=223

Like? Yes (2) | No (1)  

vivek   9 years AGO

As the sum of consecutive odd number results in square of total number of terms.
i.e 1+3+5=9 = (3^2)
1+3+5+7+9=25 = (5^2)....so
we have,
1+3+5+77+9+.....+x=12544
so, using above process number of terms= sqrt(12544)=112
Total number of terms in this series is 112.
now,
x=t(112)=a+(n-1)d (first term=1 and common diff.=2)
x=1+(112-1)2
x=1+(111*2)
x=1+222
so, x=223. ans

Like? Yes (4) | No (3)  

NESAB JAFAR   9 years AGO

223+1=224
224/2=112
112*112=12544

Like? Yes (2) | No (1)  

Anuj Rai   9 years AGO

Using ap formula
s=n/2(a+(n-1)d)

Like? Yes (2) | No (1)  

Srijan   9 years AGO

n/2[2*a+(n-1)]d=12544; a=1,d=2 {sum of n terms in Arithmetic Progression}
=>we get n=112
last term=> Tn=a+(n-1)d
a=1,n=112,d=2
the last term 'x'=223

Like? Yes (1) | No   

shreya saklecha   9 years AGO

Sn=n/2[2a+(n-1)d];
12544=n/2[2(1)+(n-1)2];
n^2=12544;
n=112;

Sn=n/2[a+l];
12544=112/2[2+l];
l=223

Like? Yes (2) | No (1)  

siddharth prakash singh   9 years AGO

1 + 3 + 5 + 7 + .......... + x = 12544
it is an AP with 1st term 1 and common difference 2 and sum=12544.
using sum formula we get n=112.
so last term=223

Like? Yes (2) | No (1)  

Akhila H.K   9 years AGO

The answer is option 7)
Because the sum of the expression is 12544 ,
First we need to find out number of terms in AP,as this expression is in AP.
So,Sn=n/2[2a+(n-1)d]
12544=n/2[2*1+(n-1)2]
25088=n/2[2+2n-2] (here cancel 2)
Therefore 2n^2=25088
n^2=12544
so n=112

Then substitute n in
Tn=a+(n-1)d
=1+(112-1)2
Tn =223.
Hence the last term is x
So x=223.

Like? Yes (1) | No   

Devendra Marghade   9 years AGO

Sum of total 'n' terms of series 1,3,5,7,.....,x
=(n/2)[2*1+(n-1)*2]=12544, n^2=12544 or n=112
So, the last term 'x'=1+(112-1)*2=223

Like? Yes (2) | No (1)  

C.DEEPAK KUMAR   9 years AGO

12544=n/2(first +last terms)
12544=n/2(2*1+(n-1)2)
n2=12544
n=112
And x=223

Like? Yes (1) | No   

MRITUNJAY   9 years AGO

12544=n/2[2*1+(n-1)2]
25088=n*2n
n^2=12544
n=112
12544=112/2(1+x)
x=223

Like? Yes (2) | No (1)  

umesh   9 years AGO

sn=n/2(2a+(n-1)d)
so we get n=112
then n=(l-a)/d+1
so we get x=223

Like? Yes (1) | No   

Ashutosh kumar mishra   9 years AGO

sum =n/2(2*first_term+(n-1)*d)
calculate the values of n where
sum=12544
d=2 (common ratio)
first_term=1

so n=112
then
x=first_term+(n-1)*d
x=223

Like? Yes (1) | No   

DEBMALYA GHOSAL   9 years AGO

s/2(2*a1 +(s-1)*2)=12544
=> s=112

x= a1+(s-1)*d
=>1+(112-1)*2
=>223

Like? Yes (1) | No   

Pargat Pal Singh   9 years AGO

number of terms=112
x= 1+2*(112-1)=223

Like? Yes (1) | No   

ankit katiyar   9 years AGO

x=1+(n-1)*2
n=(x+1)/2


12544=n/2*(1+x)

Like? Yes (1) | No   

PHARATADE SANDIP NAMADEV   9 years AGO

underroot of 12544 is 112.
series have 112*2-1=223 trms

Like? Yes (1) | No   

SHAHEEN   9 years AGO

given series is an arithemetic progression with common difference=2
sum to n terms in AP= (n/2)[2(1)+(n-1)2]=12544
===>>n^2=12544
===>n=112
Also sum=12544=(n/2)[first term+last term]
===>12544=(112/2)[1+x]
......x=223
so option is 7

Like? Yes (1) | No   

alety kiranmai   9 years AGO

It is in AP with common difference=2
12544=(n/2)[2+(n-1)2]
n=112
from this 112th term=223
so option is 7

Like? Yes (1) | No   

aman aditya   9 years AGO

Sum of first 61 term is 12321
so x= 12544-12321 =223

Like? Yes (1) | No   

sangrambadi sahoo   9 years AGO

here in the ap a=1,d=2 so we can count sum by Sn=n/2(2a+(n-1)d)
here we get n so
tn= a+(n-1)d
we get tn= 223

Like? Yes (1) | No   

Niharika Singh   9 years AGO

n/2(2*a(n-1)d)=12544
solving this we get n=112
tn=a+(n-1)d
1+111*2=223

Like? Yes (1) | No (1)  

sravani   9 years AGO

sum is n(2a+(n-1)d)/2=12544
a is 1
d is 2
so, x is 223

Like? Yes (1) | No (1)  

Amarnath Kumar Upadhyay   9 years AGO

sum of nth terms of A.p=n/2(2*a+(n-1)d)
so
12544=n/2(2*a+(n-1)d)
put a=1 and d=2
n=112
x=a+(n-1)d
x=223

Like? Yes (1) | No (1)  

KUMAR HARSH   9 years AGO

let there are n term
x=1+(n-1)*2
x=2*n-1
12544=n/2[1+x]
12544=n/2[1+2*n-1]=n^2
n=112
x= 2*n-1=2*112-1=224-1=223

Like? Yes (1) | No (1)  

Santhosh R   9 years AGO

Sn=n/2[2a+(n-1)d]=s /2[2(1)+(s-1)2]=12544
s=112
Tn =a+(n-1)d=1+(112-1)2
hence Tn =x=223

Like? Yes (1) | No (1)  

PAWAN KUMAR   9 years AGO

Total no of elements = n
So, x= 2n-1
n(1+x)/2 = 12544
=> n = 112
=> x =112*2 - 1 = 223. Ans

Like? Yes (1) | No (1)  

neha   9 years AGO

sum of ap= n/2(first term +last term)
nth term of an ap= a+(n-1)d [whre a=first trm, d= comon differcne, n=no. of terms]

so nth term=> x= 1+(n-1)*2=>
x=(2n-1) ---------first eqn
and sum=>12544=(n/2(1+x)) ---------- second eqn
put n from first eqn in second eqn

12544=(x+1)(x+1)/2
12544*4=(x+1)^2
x+1=224
x=223
ans.

Like? Yes (1) | No (1)  

Meenakshi   9 years AGO

The given series is A.P
d=2,a=1
Tn =a+(n-1)d
=1+(n-1)2
Tn =2n-1
Sum of series=n(a+l)/2
12544=n(1+2n-1)/2 (here l is the last term)
12544=n2
112=n
So last term=2(112)-1
=223
Answer is option 7)

Like? Yes (1) | No (1)  

sourabh verma   9 years AGO

sum of the no's in a.p is
s=n/2[2a+(n-1)*d]
so
12544=n/2[2+(n-1)2]
we will get n=112
as x is the last term so
x=a+(n-1)*d
so x will be 223

Like? Yes (1) | No (1)  

01 Apr 2015 Positive integers

x, y, z and k are four non zero positive integers satisfying 1/x + y/2 = z/3 + 4/k, minimum integral value of k for integral value of x, y and z will be

OPtion

1) 1
2) 2
3) 3
4) 4
5) 5
6) 6
7) 7
8) 8
9) 9
10)10

Solution

Obviously it will be 1
For example
if x = 1, y = 8 and z = 3
1/1 + 8/2 = 3/3 + 4/k
4 = 4/k
k = 1

Option 1)

Correct Option: 1 Best Solution (21)

siddharth prakash singh   9 years AGO

solving the given eq we get k=24x/(6+3xy-2xz)
as we have to obtain the minimum value of k, we will put x=1, y=8 and z=3
on putting we get k=1.

Like? Yes (7) | No (2)  

Supriya Mondal   9 years AGO

Here,
x will be 3 , y will be 8 and z will be 1.
Then k will be 1 which is the minimum value of k
Here, all the values of x,y,z,k are non zero positive integer.
So, option 1)1 is the right answer

Like? Yes (2) | No   

kranthi kanchanapally   9 years AGO

IF WE TAKE X=1 Y=8 AND Z=3
THEN
1+4-1=4/K
=>K=4/4

Like? Yes (1) | No   

Vipul   9 years AGO

3y-2z =18 when solved.
we get values of x=1,y=8 & z=3...
and thus integral value of K=1 we got

Like? Yes (1) | No   

Dr.Dipin Singh   9 years AGO

1/2 + 9/2 = 3/3 +4/1
or
5=5
so k=1

Like? Yes (2) | No (1)  

Aman   9 years AGO

x=2
y=9
z=3
k=1

Like? Yes (2) | No (1)  

Srinivas   9 years AGO

Values of x y z k are1 8 3 1

Like? Yes (1) | No   

Jayanta Dutta   9 years AGO

If I take x,y,z 1,8,3 then k becomes 1...

Like? Yes (1) | No   

abhinav upadhyay   9 years AGO

if x=1 , y= 12 , z= 9 and k=1 satisfies the equation

Like? Yes (1) | No   

nikhil   9 years AGO

x=1,y=8,z=3

Like? Yes (1) | No   

KUMAR HARSH   9 years AGO

let x=1,y=8,z=3 and k=1
1+4=1+4
so minnimum value of k is 1

Like? Yes (1) | No   

Ritesh   9 years AGO

X=1
Y=8
Z=3
K=1

Like? Yes (1) | No   

Vaibhav Mishra   9 years AGO

min value of k=1
x=1,y=8,z=3

Like? Yes (2) | No (1)  

PAWAN KUMAR   9 years AGO

put k=1, x=1, y=8, z=3

Like? Yes (1) | No (1)  

APPIKONDA SANTOSH NAIDU   9 years AGO

1

Like? Yes (1) | No (1)  

jaganmohan rao .pola   9 years AGO

1

Like? Yes (1) | No (1)  

Amarnath Kumar Upadhyay   9 years AGO

put k=1 then
1/x+y/2= (z+12)/3
when z=3,y=8,x=1
LHS=RHS

Like? Yes (2) | No (2)  

Jay parmar   9 years AGO

Optn 1

Like? Yes (1) | No (1)  

pranith   9 years AGO

take 1,8,3 values of x y z

Like? Yes (1) | No (1)  

prabhat kumar   9 years AGO

when x=1,y=8,k=1 then z will be 3

Like? Yes (1) | No (1)  

bharat bhuriya   9 years AGO

1/x+y/2-z/3=4/k
According to question
x,y,z,k=1,2,3,4,5,6,7,8......... n
K is minimum integral value
Assume
K=1,x=1,y=8,z=3
1+4-1=4
Eqn satisfy
K=1

Like? Yes (1) | No (1)  

31 Mar 2015 Number of subjects

In an examination a student got 88%. If minimum possible marks in any subject is 64, then number of subjects in the examination are

OPtion

1) 10
2) 9
3) 8
4) 7
5) 6
6) 5
7) 4
8) 3
9) 2
10)1

Solution

For getting minima in one subject, he should get maxima in other subjects.
Let us suppose he got 100 in all other subjects
then
(n-1)100 + 64 = n*88
100n - 36 = 88n
n = 3

Option 8)

Correct Option: 8 Best Solution (12)

Supriya Mondal   9 years AGO

Marks of 1st subject is 64
and marks of 2nd and 3rd subjects is 100 each
So, minimum 3 subject needed to get the percentage 88% overall
So, option 8)3 is the right answer

Like? Yes (3) | No   

sandeep ramchandra pawaskar   9 years AGO

option 8 is correct

Like? Yes (8) | No (6)  

RAMNARAYAN SWAMI   9 years AGO

in one subject 64
and in 2 subjects 100
then 264/300*100=88%

Like? Yes (1) | No   

SUSHANT KUMAR   9 years AGO

given
avg=88
min marks=64
if two subjects marks=100
then avg becomes 264/3=88
so total subject= 3

Like? Yes (1) | No   

Keshav Kr   9 years AGO

If he gets 64 in 1 subject , he needs to get 24 more to get 88%.
So if he scores 100 in other two subjects(12+12) he gets 88% in 3 subjects.

Like? Yes (1) | No   

PRASHANT KUMAR   9 years AGO

(100-64)/(100-88)=3=min possible no. of subjects

Like? Yes (1) | No   

shareef   9 years AGO

64+100+100 = 264
(264/300)*100 = 88%

Like? Yes (4) | No (4)  

Prithwijit Ghosh   9 years AGO

He got I'm a subject will be 100
So he got max no is 100-88=12 no in each no
And it cover at least 2 subject
So his total subjects is 2+1=3

Like? Yes (2) | No (4)  

jaganmohan rao .pola   9 years AGO

3

Like? Yes (2) | No (4)  

prem   9 years AGO

if he got in a sub 64 marks and other two sub is 100 each
then % marks=264/300=0.88=88%

Like? Yes (2) | No (4)  

Sanjoy   9 years AGO

let,the total no of subjects=n
and we also assume that in rest of the subject the student got full marks i.e. 100

according to the question,
64+(n-1)*100=88*n
by solving this we get, n=3

Like? Yes (2) | No (4)  

JANARTHANAN RAM   9 years AGO

100+100+64=264. 264/3=88. so we need 3 subjets to get 88%.

Like? Yes (2) | No (4)  

30 Mar 2015 Number Problem

If 64259 - 49857 = 25602
4958 - 3972 = 1026
Then
98654 - 24318 = ?

OPtion

1) 74344
2) 74336
3) 74844
4) 47344
5) 74328
6) 47844
7) 87444
8) 74324
9) 73242
10)74747

Solution

Subtract smaller number by greater number in every place for example
91 - 17 = (9-1)(7-1)
= 86

Correct Option: 1 Best Solution (100)

sam   9 years AGO

larger no-smaller no

Like? Yes (3) | No   

Md Shahid Akhter   9 years AGO

From two numbers subtract smaller digit from the greater at same position. Like-
64259 - 49857 = 25602
digits at first place of both nos.- 6 and 4 so 6-4 = 2
digits at 3rd places of both nos.- 2 and 8 so 8-2 = 6
Similarly for all other places.
Therefore-
98654 - 24318= 74344

Like? Yes (1) | No   

Harsh Poddar   9 years AGO

65259-49857=24602
6-4=2
9-5=4
8-2=6
5-5=0
9-7=2
so 24602
similarly
the next one
hence answer is 74344
option 1

Like? Yes (1) | No   

praveen kumar   9 years AGO

1 is correct ans

Like? Yes (1) | No   

Ankush Surana   9 years AGO

98654-24318=74344
1. 9-2=7
2. 8-4=4
3. 6-3=3
4. 5-1=4
5. 8-4=4

Like? Yes (1) | No   

Meenakshi   9 years AGO

simple subtraction not in order...(i,e a-b=b-a)
so answer is a)

Like? Yes (1) | No   

Surit Datta   9 years AGO

Difference from the digits not the original difference,
like,
6 - 4 = 2
4 - 9 = -5 ignore minus
2 - 8 = -6 ignore minus
5 - 5 = 0
9 - 7 = 2
so the difference is in this above way,
25602
similarly for the second given number,
4958 - 3972
4 - 3 = 1
9 - 9 = 0
5 - 7 = -2 ignore minus
8 - 2 = 6
so he difference is,
1026
similarly for the given difference we calculate,
98654 - 24318
9 - 2 = 7
8 - 4 = 4
6 - 3 = 3
5 - 1 = 4
4 - 8 = -4 ignore minus
so it is 74344
so option 1
that's it.

Like? Yes (3) | No (2)  

Dorababu M   9 years AGO

substact high value with low value by corresponding positions .
given numbers are 98654 and 24318 ,
9-2 7
8-4 4
6-3 3
5-1 4
8-4 4
then answer will be 74344

Like? Yes (1) | No   

sravani   9 years AGO

difference between the numbers in sequence
so 74344

Like? Yes (1) | No   

sompon temtheerakij   9 years AGO

64259 - 49857 = 25602
6-4=2 , 9-4=5 , 8-2=6 , 5-5=0 , 9-7=2
4958 - 3972 = 1026
4-3=1 , 9-9=0 , 7-5=2 , 8-2=6
98654 - 24318 = 74344

Like? Yes (1) | No   

MRITUNJAY   9 years AGO

subtract smaller digit from greater one
64259-49857=25602
4958-3972=1026
98654-24318=74344

Like? Yes (2) | No (1)  

SANTOSH SAHOO   9 years AGO

Result digit=greater digit-lower digit

so option 1 is correct ans

Like? Yes (2) | No (1)  

anand vijay   9 years AGO

1st no.6-4||4-9||2-8|5-5|9-7=25602
similarly,
9-2|8-4|6-3|5-1|4-8=7|4|3|4||-4|=74344(taking mod of the last digit i.e negative no.)
option 1.

Like? Yes (1) | No   

jaganmohan rao .pola   9 years AGO

74344

Like? Yes (1) | No   

neha   9 years AGO

64259
-49857
=>6-4=2
4-9=-5 (ignore -ve sign)
2-8=-6 (ignore -ve sign)
5-5=0
9-7=2
subtract corresponding numbers and if the individual result is negative, ignore the negative sign.
similarly 4958
-3972
=>4-3=1
9-9=0
5-7=-2 (ignore -ve sign)
8-2=6
hence
98654
-24318
=> 9-2=7
8-4=4
6-3-3
5-1=4
4-8=-4 (ignore -ve sign)
ans= 74344

Like? Yes (1) | No   

ABHINAV PUSHPAM   9 years AGO

Difference of each digit 74344
Option 1

Like? Yes (1) | No   

SUSHANT KUMAR   9 years AGO

64259 - 49857 = 25602
6-4=2
9-4=5
8-2=6
5-5=0
9-7=2
4958 - 3972 = 1026
4-3=1
9-9=0
7-5=2
8-2=6
SIMILLARLY
98654-24318=74344

Like? Yes (1) | No   

KALYAN KUMAR REDDY VALLURU   9 years AGO

74344

Like? Yes (1) | No   

pasupuleti pranavasree   9 years AGO

subtracting corresponding digits from the highest number

Like? Yes (1) | No   

Jaspalsingh Parmar   9 years AGO

option 1 is correct

Like? Yes (2) | No (1)  

sandeep ramchandra pawaskar   9 years AGO

simply minus smaller digit from greater digit in respective place
we get,
98654 - 24318 =74344

Like? Yes (2) | No (1)  

RAMNARAYAN SWAMI   9 years AGO

64259-49857=25602
6-4=2,9-4=5,8-2=6,5-5=0,9-7=2
4958-3972=1026
4-3=1,9-9=0,7-5=2,8-2=6
So,
98654-24318=74344

Like? Yes (1) | No   

prem kishor   9 years AGO

simple minus greater-smaller

Like? Yes (1) | No   

Jay parmar   9 years AGO

optn 1 is correct

Like? Yes (1) | No   

Prithwijit Ghosh   9 years AGO

Different of each digit

9-2=7
8-4=4
6-3=3
5-1=4
4-8=4(only difference)

Like? Yes (1) | No   

Niharika Singh   9 years AGO

64259-49857=25602 smaller no get subtracted by lower no
6-4=2,9-4=5,8-2=6,5-5=0,9-7=2
similarly 98654-24318=74344

Like? Yes (1) | No   

mohsin   9 years AGO

Subtract each digit and don't consider the (Carry forward)

ex
64259-49857
6-4=2
4-9=5
2-8=6
5-5=0
9-7=2

Like? Yes (1) | No   

Yathiraj   9 years AGO

When subtracting each digit, Just subtract the smaller number from the bigger number.

Like? Yes (1) | No   

Josepheena Joseph   9 years AGO

98654 - 24318 = 74344

Like? Yes (1) | No   

Srinivas   9 years AGO

subtract individual digit in the number from greater digit

Like? Yes (1) | No   

shareef   9 years AGO

64259-49857 = 25602
here we get
6-4 = 2
9-4 = 5
8-2 = 6
5-5 = 0
9-7 = 2
like wise 98654 - 24318 = 74344

Like? Yes (1) | No   

kalindi   9 years AGO

98654-24318=74344

Like? Yes (1) | No   

nani    9 years AGO

From Each number see the differenceto oposit similar place number.

Like? Yes (1) | No   

Shintala Divya   9 years AGO

64259-49857=25602
6-4=2;4~9=5;2~8=6;5-5=0;9-7=2
4958-3972=1026
4-3=1;9-9=0;5~7=2;8-2=6
using same logic=>
98654-24318=74344(ans)
9-2=7;8-4=4;6-3=3;5-1=4;4~8=4

Like? Yes (1) | No   

siddharth prakash singh   9 years AGO

Result is the mod difference of every digit.
so,
98654 - 24318 = 74344

Like? Yes (1) | No   

Rayagouda    9 years AGO

Substrct the digit from high value to low level

Like? Yes (1) | No   

Samyak   9 years AGO

deduct same place digit from the other one and ignore negative.
So ans will be option 1

Like? Yes (2) | No (1)  

NEHA KUMARI   9 years AGO

9-2=7
8-4=4
6-3=3
5-1=4
8-4=4

Like? Yes (1) | No   

aman aditya   9 years AGO

Difference between two number is answer
8-4=4
5 - 1=4
6 -3 =3
8 - 4=4
9 - 2 = 7

Like? Yes (1) | No   

Pragati Rode   9 years AGO

subtract digit to digit(largest digit - smallest digit)
(6-4)(9-4)(8-2)(5-5)(9-7)= 25602

similarly
9 8 6 5 4
2 4 3 1 8
-------------
7 4 3 4 4

Like? Yes (1) | No   

bhavani   9 years AGO

64259-49857=25602
6-4=2;4~9=5;2~8=6;5-5=0;9-7=2
4958-3972=1026
4-3=1;9-9=0;5~7=2;8-2=6
98654-24318=74344
9-2=7;8-4=4;6-3=3;5-1=4;4~8=4

Like? Yes (1) | No   

arush gupta   9 years AGO

74344 is the answer

Like? Yes (1) | No   

rakesh   9 years AGO

difference of each digit.

Like? Yes (1) | No   

shabana banu shaik   9 years AGO

9-2,8-4,6-3,5-1,8-4 is 74344

Like? Yes (1) | No   

vivek raj   9 years AGO

only greater no is substracted from smaller

Like? Yes (1) | No   

PAWAN KUMAR   9 years AGO

Subtract the corresponding terms.

Like? Yes (1) | No   

mukund   9 years AGO

In this type of subtraction which we can observe from the given two problems we have to subtract from higher digit to lower digit without care of the presence of the digit in the numbers

Like? Yes (1) | No   

Devendra Marghade   9 years AGO

difference of the corresponding digits of the two numbers.
98654 - 24318=(9-2)(8-4)(6-3)(5-1)(8-4)=74344
Ans=option (1)

Like? Yes (1) | No   

mani   9 years AGO

9-2=7
8-4=4
6-3=3
5-1=4
8-4=4

Like? Yes (1) | No   

ADERU CHENCHU NITHISH   9 years AGO

98654-24318=74344
9-2=7,8-4=4,6-3=3,5-1=4,8-4=4....so74344

Like? Yes (1) | No   

darladiwakar   9 years AGO

DIFFERENCE BETWEEN TWO NUMBERS IS TAKE AS POSITIVE ONLY.EVEN THOUGH IT IS NEGATIVE.

Like? Yes (1) | No   

navakanth reddy   9 years AGO

10 substraction

Like? Yes (1) | No   

Sanjoy   9 years AGO

difference b/w unit no of each digit.
98654 - 24318=|9-2| |8-4| |6-3| |1-5| |4-8| =74344

Like? Yes (1) | No   

Thirupathi Reddy   9 years AGO

answer:74334

Like? Yes (1) | No   

sivaramakrishna   9 years AGO

9-2=7
8-4=4
6-3=3
5-1=4
8-4=4

Like? Yes (1) | No   

madhusudhana   9 years AGO

subtract each numbers opposite digits

Like? Yes (1) | No   

Supriya Mondal   9 years AGO

Here, lower number is subtracted from higher number for the same index of the two numbers.
So, applying this we get the answer is 74344
So, option 1)74344 is the right answer

Like? Yes (2) | No (1)  

Abhishek    9 years AGO

here in above we see if number is greater we do reverse subtraction that is
8-6=2, 9-4=5, 7-5=2
similarly in problem
8-4=4, 5-1=4, 6-3=3, 8-4=4, 9-2=7 will be ans 74344

Like? Yes (1) | No   

Math Lovers   9 years AGO

The operator is taking the difference of digits at corresponding place.

Like? Yes (1) | No   

Jitendra Kumar   9 years AGO

(9-2)(8-4)(6-3)(5-1)(8-4)

Like? Yes (1) | No   

Suboojitha Prem   9 years AGO

The digits in the place position of one number is subtracted from the digits of the other number.
Eg: 4958-3972=1026
where
4-3=1
9-9=0
5-7=2
8-2=6
And negative signs are not considered.

Like? Yes (1) | No   

SHAHEEN   9 years AGO

subtract each number one by one
ans is option 1

Like? Yes (1) | No   

alety kiranmai   9 years AGO

subtract each number one by one
ans is option 1

Like? Yes (1) | No   

NESAB JAFAR   9 years AGO

subtract digit which is greter than respective digit .and using syply subtract formulae

Like? Yes (1) | No   

A M ANKIT KALLURAYA   9 years AGO

difference of the two numbers

Like? Yes (1) | No   

LOKESH KUMAR   9 years AGO

Given:
64259 - 49857 = 25602
First Element of first number is 6(from R.H.S);
First element of second Number is 4
So 6-4=2
Similarly for All Numbers
So we Get
98654 - 24318=74344

Like? Yes (1) | No   

s.durgadevi   9 years AGO

9-2=7
8-4=4
6-3=3
5-1=4
8-4=4
so option is 1 ie 74344

Like? Yes (2) | No (1)  

mayankgupata   9 years AGO

bcoz last digite 4-8 not possibale so 8-4 possibale from self logic

Like? Yes (1) | No   

bk thapa   9 years AGO

for each corresponding digits of minuend and subtrahend,
Minuend - Subtrahend = Difference
where minuend is greater than subtrahend,
if not then exchange values

Like? Yes (1) | No   

sanjaya kumar mahal   9 years AGO

like the example

Like? Yes (1) | No   

varsha   9 years AGO

SUBTRACT GREATER NO WITH SMALL ONE

Like? Yes (1) | No   

DEBAYAN BASU   9 years AGO

98654-24318
ans will be the subtraction of numbers present in the same position of the two number groups.
ex: (9-2) (8-4) (6-3) (5-1) (4-8)

Like? Yes (1) | No   

manoj   9 years AGO

1 word 1 st element - 2nd word 1 st element= |ans|

Like? Yes (1) | No   

shalini mishra   9 years AGO

one one no. KO subtract Karna padega

Like? Yes (1) | No   

KUMAR HARSH   9 years AGO

different beetween digit
9-2,8-4,6-3,5-1,4-8
ans 74344

Like? Yes (1) | No   

Testing Account   9 years AGO

8

Like? Yes (1) | No   

karthik hariharan   9 years AGO

9-2=7
8-4=4
6-3=3
5-1=4
8-4=4

Like? Yes (1) | No   

RASHMI RANJAN SINGH   9 years AGO

9-2=7,8-4=4..........so on

Like? Yes (1) | No   

Pranati Kundu   9 years AGO

9-2=7
8-4=4
6-3=3
5-1=4
4-8=|-4|=4

Like? Yes (1) | No   

E.C.B.BALAJI   9 years AGO

9-2=7
8-4=4
6-3=3
5-1=4
4-8=-4
So Ans is 74344

Like? Yes (1) | No   

Rahul Das   9 years AGO

64259-49857=25602
if we get difference between each of the number we get 25602
and for 98654-24318 we get
difference between (9&2)(8&4)(6&3)(5&1)(4&8) we get 74344

Like? Yes (1) | No   

Vaibhav Srivastava   9 years AGO

9-2 = 7
8-4 = 4
6-3 = 3
5-1 = 4
4-8 = 4
so, 74344

Like? Yes (1) | No   

C.DEEPAK KUMAR   9 years AGO

Don't follow the rules of subtraction just subtract big num with small one we get 74344

Like? Yes (1) | No   

surya    9 years AGO

subtract two numbers individually.....
doesn't consider the carry....

Like? Yes (1) | No   

mineghostrider   9 years AGO

just subtract smaller digit from corresponding bigger digit

Like? Yes (1) | No   

RANGEETHA.S   9 years AGO

In the given examples the smaller no was subtracted from the bigger no irrespective of their sign

Like? Yes (1) | No   

Santhosh R   9 years AGO

Logic-
9-2=7,8-4=4,6-3=3,5-1=4,8-4=4
And=74344

Like? Yes (1) | No   

POOJA SINGH   9 years AGO

6-4=2 9-4=5 8-2=6 5-5=0 9-7=2 I.e.25602
similarly,
9-2=7
8-4=4
6-3=3
5-1=4
8-4=4
I.e.74344

Like? Yes (1) | No   

sairamesh   9 years AGO

98654-24318=74344

Like? Yes (1) | No   

T.K.Gopinath   9 years AGO

just to subtract each individual terms..

Like? Yes (1) | No   

nikhil   9 years AGO

a-b=c

Like? Yes (1) | No   

monalisa   9 years AGO

the numbers at the same place are subtracted from each other

Like? Yes (1) | No   

sayantani jana   9 years AGO

option 1 is correct

Like? Yes (1) | No   

gangadhar reddy   9 years AGO

98654-24318=(9-2)(8-4)(6-3)(5-1)(8-4)=74344

Like? Yes (1) | No   

gaurav tyagi   9 years AGO

we are subtracting lower digit from higher digit.

Like? Yes (1) | No   

vishwa   9 years AGO

74344

Like? Yes (1) | No   

Sagar Narula   9 years AGO

in this question we subtract the lower number from the higher number
98654 - 24318
so first subtract 4 from 8 we get 4
then subtract 1 from 5 we get 4
so follow the same procedure we get 74344 as the required answer

Like? Yes (1) | No   

ANUJ KUMAR   9 years AGO

Each digit of one number is subtracted from corresponding digit of second number and then take its absolute value

Like? Yes (1) | No   

vivek   9 years AGO

74344

Like? Yes (1) | No   

JANARTHANAN RAM   9 years AGO

Difference of 1st no,2nd no,.....
98654-24318=(9~2) (8~4) (6~3) (5~1) (4~8)=74344

Like? Yes (2) | No (2)  

27 Mar 2015 Two digit numbers

A two digit number is such that its 7 multiple is a perfect square. Sum of all such possible two digit numbers will be

OPtion

1) 85
2) 91
3) 95
4) 100
5) 109
6) 112
7) 113
8) 121
9) 125
10)131

Solution

Since 7 multiple of the number is a perfect square so no will have a factor 7 and other factor will be definitely be a perfect square possibilities for the other factor are 1, 4, 9, 16 ....
7*1 = 7 digit
7*4 = 28 digit
7*9 = 63 digit
7*16 = 112 digit
So sum = 63 + 28 = 91

Option 2)

Correct Option: 2 Best Solution (26)

Surit Datta   9 years AGO

Two such numbers are possible
this are,
28 and 63
28*7 = 196
63*7 = 441
so summation of 28 and 63 is 91
so option 2
that's it.

Like? Yes (26) | No (4)  

Sanu Panji   9 years AGO

7*99= 693. so squre will bw less then 693 and number will be less then |sqrt(693)|=26
also the squre will have 7^2 as a factor. there are two of this kind.
14^2=196
21^2=441

so two number is 196/7=28 and 441/7=63
sum= 28+63 =91

Like? Yes (4) | No   

MRITUNJAY   9 years AGO

number will be 28 and 63.
when multiply by 7.
28*7=196=14^2
63*7=441=21^2
sum will be=63+28=91

Like? Yes (2) | No   

Yathiraj   9 years AGO

2 digit numbers whose multiple of 7 is a perfect square are 28 & 63.
Hence, 28+63 = 91

Option 2.


PL/SQL program
===============
declare
v_sum number := 0;
v_sqrt_val number;
begin
for i in 10..99
loop
v_sqrt_val := sqrt(i*7);

if v_sqrt_val = trunc(v_sqrt_val) then
v_sum := v_sum + i;
dbms_output.put_line('i: ' || i);
end if;
end loop;

dbms_output.put_line('sum of all such 2 digit numbers ' || v_sum);
end;
/

Like? Yes (2) | No   

Meenakshi   9 years AGO

The only possible two digit combinations whose 7 multiple is perfect squares are:63 and 28
The sum of digits are:63+28=>91

Like? Yes (2) | No   

Prithwijit Ghosh   9 years AGO

1*1*7=7 its 1 digiys
2*2*7=28
3*3*7=63
4*4*7=113 its 3 digits
So answer will be 28+63=91

Like? Yes (2) | No   

prem kishor   9 years AGO

these numbers are 28 and 63.
because 7*_*_
for perfect square one 7 should be and second banks can be 1,4,9.but if we put 1,then7*1 is single digit.
so, 7*4, and 7*9 two digit numbers are possible.

Like? Yes (2) | No   

anureet   9 years AGO

when 7{4+9+16+.........) is such sum
when 7{13}=91
7{4+9+16}=203

Like? Yes (2) | No   

Pragati Rode   9 years AGO

Find the 2 digit number which is multiple of 7...
14, 21,28 ...98
but there are two numbers i.e. 28 n 63
multiplying by 7 to these numbers we get perfect square.
addition of these two numbers is 91

Like? Yes (2) | No   

sravani   9 years AGO

7*4*7 so num is 28
7*9*7 so sum is 63
7*16 is 3digit
so sumof these two is 91

Like? Yes (1) | No   

GIRISH TYAGI   9 years AGO

7*4*7=28*7=196 AND 7*9*7=63*7=441

Like? Yes (1) | No   

Devendra Marghade   9 years AGO

28 & 63 are such a two numbers which results into squares, when multiplied by 7
28*7=196 and
63*7=441
So Sum 28+63=91
Ans: 2)

Like? Yes (1) | No   

Jaspalsingh Parmar   9 years AGO

28 and 63

Like? Yes (1) | No   

Jay parmar   9 years AGO

Optn 2

Like? Yes (1) | No   

aman aditya   9 years AGO

two nember are 28,63
so
28+63=91

Like? Yes (1) | No   

rakesh   9 years AGO

28,63
28+63=91

Like? Yes (1) | No   

Srinivas   9 years AGO

7*28=196
7*63=441
so 63+28 = 91

Like? Yes (1) | No   

SUSHANT KUMAR   9 years AGO

two digit no whose 7 multiple is a perfect square are 28 and 63
28*7=196 which is a perfect square
63*7=441 which is a perfect square
hence the sum is 28+63=91.

Like? Yes (1) | No   

pasupuleti pranavasree   9 years AGO

28*7=196. 196=14^2
63*7=441. 441=21^2
and 28+63=91

Like? Yes (1) | No   

kranthi kanchanapally   9 years AGO

from 11 to 99 the numbers 28 and 63 will give the perfect square when multiply with 7
so the sum=28+63=91

Like? Yes (1) | No   

sompon temtheerakij   9 years AGO

two numbers are 4*7 = 28 and 9*7 = 63
sum = 28+63 = 91

Like? Yes (1) | No   

mukund   9 years AGO

28&63 are two digit number
So sum is 91

Like? Yes (1) | No   

vivek   9 years AGO

only two such number are possible i.e 28 and 63.
28+63=91

Like? Yes (1) | No   

Madhumoy Gope   9 years AGO

The general no. is- N=(n^2)*7,such that (9

Like? Yes (1) | No   

Aritra Chongdar   9 years AGO

91/7=13
two digits are 1 and 3
1+3=4 ; 4 is a perfect square of 2

Like? Yes (1) | No   

Ritesh   9 years AGO

7*28=14*14
7*63=21*21
Therefore 63+28=91

Like? Yes (1) | No   

26 Mar 2015 Time, distance and speed

A man runs with speed 54 km/hr in a straight path starting from A at 8 AM for 35 minute. What should be his speed for rest of the motion, completing 100 kms from A to B upto 9 AM.

OPtion

1) 112.2 km/hr
2) 126.5 km/hr
3) 136.4 km/hr
4) 142.6 km/hr
5) 156.8 km/hr
6) 160.2 km/hr
7) 162.4 km/hr
8) 164.4 km/hr
9) 166.4 km/hr
10)168.2 km/hr

Solution

Distance covered in 35 minute
= 54*35/60 = 31.5 km
So speed required = 100-31.5/ (25/26)
68.5*60/25 = 164.4 km/hr

Option 8)

Correct Option: 8 Best Solution (62)

Md Shahid Akhter   9 years AGO

Distance travelled in 35 min= 54*35/60 =31.5 km
Distance left to be travelled= 100-31.5=68.5 km
Time left to complete the left distance= 60-35 = 25 min
Speed required= 68.5/(25/60)= 164.4 km/hr

Like? Yes (7) | No (3)  

RAKESH   9 years AGO

54*35/60 + x*25/60 = 100

=> x = 164.4 kmph

Like? Yes (5) | No (2)  

SANTOSH SAHOO   9 years AGO

100-(54/60)*35=(x/60)*25
=>x=164.4km/h

Like? Yes (2) | No   

Supriya Mondal   9 years AGO

Distance covered in first 35 min=(35/60)*54=31.5 km
So, distance covered in last 25 min=100-31.5=68.5 km
So speed of the man in the last 25 min=(68.5*60)/25=164.4 km/hr
So, option 8)164.4 km/hr is the right answer

Like? Yes (2) | No   

SURESH STANAM   9 years AGO

With 54kmph speed he covers 31.5km in 35min
now,he want to cover 68.5km in 25 min
then,
68500/1500=45.66*18/5=164.4kmph

Like? Yes (2) | No   

PRASHANT KUMAR   9 years AGO

speed for the rest of the motion=(1000000-15*35*60)/(25*60)
=45.66m/s
=164.4km/hr

Like? Yes (2) | No   

susmit   9 years AGO

The distance covered in 35 minutes is 54*35*60 = 31.5 km
Remaining distance is 68.5 km
So the speed required = (68.5*60)/25
= 164.4 km/h

Like? Yes (1) | No   

Devendra Marghade   9 years AGO

Distance covered upto 35 min. @54 Km/hr=54*(35/60)=63/2 Km.
Now distance remained to cover out of total 100 Km=
100-(63/2)=137/2 & time remained=60-35=25 min.
So speed(Km/hr) required=(137/2) / (25/60)=164.4 Km/hr.

Like? Yes (1) | No   

aman aditya   9 years AGO

Distance travel in 35 min=54/60 *35=31.5km
Distance to travel on 25 mn=68.5 km
Speed= (68.5/25)*60=164.4 km/hr

Like? Yes (1) | No   

Srinivas   9 years AGO

dist travelled in 35 min is 35*54/60 = 31.5 km
remaining = 100-31.5 = 68.5
so time req = 68.5*60/25 = 164.4

Like? Yes (1) | No   

Santhoshkumar   9 years AGO

for 35 mins he traveled 35/60*54=31.5km
remaining 68.5km he takes speed of 68.5/25/60=164.4km/hr

Like? Yes (2) | No (1)  

sompon temtheerakij   9 years AGO

distance = 35/60*54 = 31.5 km
distance left = 100-31.5 = 68.5 km
time left = 60-35 = 25 min
speed = 60/25*68.5 = 164.4 km/hr

Like? Yes (1) | No   

sourabh verma   9 years AGO

initialy man was running 9km in 10 min so in 35 min he ran 31.5 km
so remaining dis 68.5km he has to cover in remaining 25min so speed should be 164.4

Like? Yes (1) | No   

Pranati Kundu   9 years AGO

distance travelled with speed of 54km/hr=54*35/60=31.5
distance left =100-31.5=68.5m
time left =60--35=25min=25/60hr
68.5=speed *25/60
speed=164.4 km/hr

Like? Yes (1) | No   

ABHINAV PUSHPAM   9 years AGO

35*54/60=31.5km
100-31.5=68.5km more to be traveled in (60-35)=25min
So, 68.5*60/25= 164.40 km/hr
Option 8)

Like? Yes (1) | No   

Josepheena Joseph   9 years AGO

Distance travelled in 35 minute = 54*(35/60)=31.5
Distance travelled in 25 minute = 100-31.5=68.5
Required speed = 68.5/(25/60) = 164.4

Like? Yes (1) | No   

Prithwijit Ghosh   9 years AGO

He goes in 35 min=(54*35)/60=31.5

Rest time25 main
Rest distance (100-31.5)=64.5
So speed will be(68.5*60)/25=164.4km/h

Like? Yes (1) | No   

pavizham.s   9 years AGO

total dist=100km
in 35sec he traveled dist=speed*time
=54*5/18 *35*60
=31500
remaining dist=100000-31500
=68500
speed=dist/time
=68500/25*60
=45.66m/sec
converting to km/hr
45.66*18/5
=164.4km/hr

Like? Yes (1) | No   

manish   9 years AGO

54 km/hr

54/60 km/min = 9/10

distance covered = 9/10*35=31.5

remaining distance= 100-31.5=68.5

speed = 68.5*60/25=164.4 km/hr

Like? Yes (1) | No   

Yathiraj   9 years AGO

The man has covered 31.5 KMs in 35 minutes at a speed of 54 km/hr.
He has to cover remaining 68.5 KMs in 25 minutes
and hence 164.4 km/hr is the required speed.

(68.5 * 60)/25 = 164.4

Option 8.

Like? Yes (4) | No (3)  

Testing Account   9 years AGO

to e remain 25minutes distance is 68.5km thenspeed=distance/time get 164.4km

Like? Yes (1) | No   

praveen kumar   9 years AGO

68.5 * 60/25= 164.4 km/hr

Like? Yes (1) | No   

vikas singh   9 years AGO

distance covered in 35 min.=54*(35/60)=31.5 km
rest time 25 min speed should be (100-31.5)/(25/60)=164.4km/hr

Like? Yes (1) | No   

SUSHANT KUMAR   9 years AGO

distance covered in 35 min = 35*54/60=31.5
so remaining 68.5 km has to be covered in 25 minutes
hence speed = 68.5/25*60=164.4

Like? Yes (1) | No   

GIRISH TYAGI   9 years AGO

54*35/7 + X*25/60=100
X=164.4

Like? Yes (1) | No   

Rahul Das   9 years AGO

man speed =54/60 km/min=0.9km/min
for 35 min he run = 0.9*35=31.5 km
he have to run (100-31.5)km within 25 min
so his speed for last 25 min = (100-31.5)/25=2.74 km/min
2.74*60 km/hr=164.4 km/hr

Like? Yes (1) | No   

PAWAN KUMAR   9 years AGO

Distance covered in 35 min = 54*35/60 = 31.5 km
Remaining distance = 100-31.5 = 68.5 km
Time = 25 min
So, speed = (68.5/25)*60 kmph = 164.4 kmph. Ans

Like? Yes (1) | No   

mukund   9 years AGO

Rest time is 25 min
He has to travel 137/2
So speed =164.4km/hr

Like? Yes (1) | No   

Mahindrakar Dinesh   9 years AGO

Given that he runs at the speed of 54kmph for the first 35 min. So the distance covered by him in 1min = 54/60=0.9 kms. Then distance covered in 35 min = 0.9*35 = 31.5kms.
So he has to cover the remaining 68.5kms in 25 min. i.e (68.5*60)/25= 164.4kmph

Like? Yes (1) | No   

Vaibhav Srivastava   9 years AGO

Distance in 35 minutes = 31.5km
By, d = t *v i.e;(35/60)*54
Distance measured in rest of 25 minutes = 68.5km
So speed in 68.5km in rest of 25 minutes = 68.5/(25/60)
= 164.4 km/hr

Like? Yes (1) | No   

jaganmohan rao .pola   9 years AGO

164.4km/hr

Like? Yes (1) | No   

Sanjoy   9 years AGO

in 35 min, dist=(35/60)*54=31.5 kms
Rest of dist= 100-31.5=68.5 kms
time left= {(8 AM to 9AM) - (35/60)} hrs =5/12 hrs
speed for rest of the motion= 68.5/(5/12)= 164.4 km/h

Like? Yes (1) | No   

nitin kishore   9 years AGO

s=d/t
so,
d=54*35/60=31.5

now,
s=68.5*60/25=164.4

Like? Yes (1) | No   

Arijit Chanda   9 years AGO

because he cover up 68.5 km in 25 minutes so his speed in hour= (68.5*60)/25=164.4

Like? Yes (1) | No   

shreya saklecha   9 years AGO

man can travel 31.5km in =35min
now he has to travel left distance=100-31.5=68.5km
time he can take to travel=60-35=25min=25/60=0.416hr
therefore
speed=68.5/0.416=164.4km/hr

Like? Yes (1) | No   

Misti Kumar   9 years AGO

distance=(54*35)/60=31.5 km
remaining = 100-31.5=68.5km
and time=60-35=25min.
speed=(68.5*60)/25=164.4 km/hr

Like? Yes (1) | No   

Abbas Ali   9 years AGO

since speed given is 54km/hr or 0.9km/min
nw in 35 min he covers 31.5km
nw in remaining 25min he need to cover 68.5km
so his speed should be 164.4km/hr...

Like? Yes (1) | No   

Pragati Rode   9 years AGO

first calculate the distance at 54km/hr in 35 min
subtract this distance from total distance.
calculate the speed i. e multiplication of remaining distance and and remaining time i. e. 25 min
(by taking proper unit)

option is 8)

Like? Yes (1) | No   

prem   9 years AGO

distance cover in 35 min=
54*35/60=31.5
remaining dist=68.5 km
remaining time =25min
speed for rest of motion=68.5/(25/60)=164.4

Like? Yes (1) | No   

SAKTHEESVARI S   9 years AGO

using, distance=speed*time, 1st we calculate the distance covered for 35 minutes; we get 31.5 km
subtract 31.5 from 100 to get the remaining distance, we get 68.5 km; using this distance and remaining time 25 minutes, we calculate speed, the result is 164.4km/hr

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Pooja Shaw   9 years AGO

distance covered in 35min=(54*(35/60))=63/2=31.5
remaining distance=100-31.5=68.5km
remaining time=60-35=25min.
required speed=(68.5*(60/25))=164.4 km/hr

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Sagar Kumar Subudhi   9 years AGO

in 35 mins he can cover 31.5 km and rest 68.5 km can be covered within 25 mins by 164.4km/hr

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kranthi kanchanapally   9 years AGO

the distance covered in 35 min is=63/2 and the remaing distance is=137/2 has to cover in 25 min
so speed=137/2*12/5=164.4km/hr

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neha   9 years AGO

speed =distance /time
for the first phase=> find distance covered
dist=54*(35/60) [coz time is given in min so divide by 60 to convert it into hours]
dist=63/2 km
remaining dist= 100-(63/2) km
remaining time=1hr-(25/60) hr
so speed= remaining dist/(remaining time)
=> 168.8 km/hr

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Ashish Gahlot   9 years AGO

Given: speed =54 km/hr, time= 35/60 hr;
so, Distance= speed*time= (54*35)/60 =31.5 km

we have to find speed for rest distance i.e. 100-31.5 = 68.5 km.
and time left = 60-35= 25/60 hr

speed for rest distance= (68.5*60)/25 = 164.4 km/hr

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Mayank   9 years AGO

(54/60)*35=31.5
100-31.5=68.5
60-35=25
(68.5/25)*60=164.4

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pranith   9 years AGO

d1=54*35/60
=31.5
speed=(100-31.50)/25*60
=164.4km/hr

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prem kishor   9 years AGO

distance travel in 35 minute is 63/2km.
so, remaining distance is 137/2 , and remaining time is 25 minute. so speed required is 164.4 km/hr.

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siddharth prakash singh   9 years AGO

distance travelled in 35 min= 31.5km
rem dist=68.5km
rem time= 25m
so req speed=(68.5*60)/25 km/h= 164.4 km/h

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b.subbarao   9 years AGO

speed of a man=54 km/hr
distance traveled in 35 minitus=54/60*35=31.5km
remaining distance to be traveled =100-31.5=68.5km
left of the time=60-35=25 mts.
to reach the station B a man should have to maintain the speed=68.5/25*60=164.4 km/hr
so option (8) is right answer

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Abhijeet Kumar   9 years AGO

distance travel in 35 min = (54÷60)×35= 31.5km
remaining distance is 100-31.5= 68.5km
speed for remaining distance is = (68.5÷25)×60= 164.4 km...

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MRITUNJAY   9 years AGO

distance travelled in 35 minutes=54*5/18*35*60=31500
31.5 km
remaining distance=100-31.5=68.5km
remaining time=25 min
speed=68.5/25*60=164.4km/h

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Akhil   9 years AGO

In 35 mins he ran 31.5 kms. Thus he has to run 68.5 kms in 25 mins now. so answer is 68.5/(25/60) which is 164.4

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Shintala Divya   9 years AGO

distance=speed*time=54*(35/60)=31.5km
rest of the distance is=100-31.5=68.5km
rest of speed=rest of distance/remaining time to cover 68.5km
=68.5/(60-35/60)
=68.5*60/25
=164.4km/hr

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Sahil   9 years AGO

TOTAL TIME 1HR
TOTAL DISTANCE=100KM
SPEED=DISTANCE/TIME
FROM A FOR 35MINS AT 54KM/HR, DISTANCE=54*35/60=31.5KM
DISTANCE LEFT=100-31.5=68.5KM
SPEED TILL B FOR NEXT 25MINS=DISTANCE/TIME=68.5*60/25=164.4=ANSWER
TILL B FOR THE REST 25MINS,

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PRAGYA SHARMA   9 years AGO

bcz in 35 mins d=54*0.583=31.49 km distance covered.. it has to cover 68.57 km in remainin 0.417 hr.. so speed=68.57/0.417 = 164.4 km/hr

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VIDYA N   9 years AGO

he travels 31.5 km in first 35 minute. remaining he has to travel 68.5km in 25 minutes .so speed is equal to (distance/time)=164.4km per hr

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sheikh shahrukh   9 years AGO

remaining distance after running 35min is 100-31.5=68.5
so for remaning 25 min he ran with the speed of
68.5/(25/60)=164.4km/hr
option 8 is correct

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sayantani jana   9 years AGO

solving the problem get the ans.

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soumya   9 years AGO

1 hr 54km, 30 min 27 km ,35 min is 29.5km

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TUSHARKANTA SAHOO   9 years AGO

Man runs 54 km/hr
so he ll run 54*(5/18)m/sec=15m/sec
in 35 mins=15*35*60=31.5km
rest 68.5km in 25 mins
time taken=(68.5/25)*60=164.4km

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anureet   9 years AGO

54/60*35 =distance in 35 mint
100-distance in 35 minute =X
speed= X/(60-35)*60=164.4

Like? Yes (1) | No (1)