M4maths Previous Puzzles

21 Oct 2015 Time and work

A cistern has a leak which would empty it in 8 hours. A tap is turned on which admits 6 litres a minute into the cistern and it is now emptied in 12 hours. How many litres does the cistern hold?

OPtion

1) 7580
2) 7650
3) 7780
4) 7960
5) 8080
6) 8290
7) 8640
8) 7260
9) 7450
10)None of these

Solution

Part filled in 1 hours = (1/8 - 1/12) = 1/24
Therefore Time taken to fill the cistern = 24 hours
Water moved in 24 hours = (6*24*60) litres = 8640 litres
Option 7)

Correct Option: 7 Best Solution (5)

Aditya Narayan Singh   9 years AGO

lets take 24 work that is lcm of 8 hours and 12 hours.

then 24 work completed by 8 hours pipe that is 3 work per hour for empatied

then 24 work completed by 12 hours pipe that is 2 work per hour for fill the tank

diffrence of both that is 1 work per hour

then 24/ 1 ie 24 hour to take to empty the tank

hence tank capacity = 6 * 60 * 24 = 8640.

Like? Yes (32) | No (5)  

Abhisheak Kumar Missu   9 years AGO

time taken to fill the tank=1/8-1/12=1/24
since capacity of tank=24*60*6=8640

Like? Yes (12) | No (2)  

RAHUL KUMAR   9 years AGO

Part filled in 1 hour = 1/8-1/12
=1/24
Time taken to fill the cistern =
24 hrs.
Water moved in it in 24 hrs =
(6 x 60 x 24) litres = 8640
litres
Capacity of the cistern = 8640
litres.

Like? Yes (16) | No (6)  

ABHINAV PUSHPAM   9 years AGO

1/8-1/12= 1/24
So capacity will be 24*360= 8640
Option 7)

Like? Yes (6) | No (5)  

MRITUNJAY   9 years AGO

B A A-B

-8 6lit/min -12
24
-3. 1 -2
so A takes 24 hours to fill.

capacity of tank is 6*60*24=8640 litre

Like? Yes (3) | No (5)  

20 Oct 2015 Number

If 6 3 5 4 2 equals 5 2 6 3 4, what is B C D E F?

OPtion

1) D B F C E
2) D F B C E
3) D F C B E
4) D F B E C
5) E F B C D
6) B F D C E
7) D F E C B
8) C F B D E
9) F D B C E
10)None of these

Solution

D F B C E

The letters must be transposed in the same order as the numbers.

Option 2)

Correct Option: 2 Best Solution (38)

Chandrajeet Yadav   9 years AGO

1st, 2nd, 3rd, 4th, 5th = 3rd, 5th, 1st, 2nd, 4th

So B C D E F = D F B C E

Like? Yes (5) | No   

YASWANTH REDDY   9 years AGO

interchanging the alphabets according to the pattern of interchanging the numbers from first series to second series

Like? Yes (3) | No (1)  

rakesh sharma   9 years AGO

6 3 5 4 2 equals 5 2 6 3 4, Change the order same as number
B C D E F =>D F B C E

Like? Yes (2) | No   

mohan ranga rao   9 years AGO

even place numbers are 6,5,2
odd place numbers are 3,4
63542 is written as 52634
so BCDEF can be written as fallows
odd place B,D,F
even place C,E
so answer is DFBCE

Like? Yes (2) | No   

NAVEEN KUMAR   9 years AGO

6(1st) 3(2nd) 5(3rd) 4 (4th)2(5th) equals 5(3rd) 2(5th) 6(1st) 3(2nd) 4(4th)
hence similarly...
B(1st)C(2nd)D(3rd)E(4th)F(5th)........>D(3rd)F(5th)B(1st)C(2nd)E(4th)
..>ans--DFBCE(option B.)

Like? Yes (2) | No   

Vipin Prasad Saxena   9 years AGO

6 3 5 4 2
first place replaced with 3rd place.
and 2nd replaced with 4th place.
so on.
Exactly do with alphabet.

Like? Yes (1) | No   

Vishal   9 years AGO

series starts from middle element and then last and then continue from start so BCDEF = DFBCE

Like? Yes (1) | No   

SANGAVI S   9 years AGO

In 63542 3rd position 5 is in 1st place last position 2 in 2nd place similarly
3rd position D comes to 1st place last position F comes to 2nd place
Hence the answer is DFBCE

Like? Yes (1) | No   

RUPNARAYAN RANA   9 years AGO

6=B,3=C,5=D,4=E,2=F,,,
For 52634 it is DFBCE.
Hence option 2)

Like? Yes (1) | No   

Nandkishor jaiswal   9 years AGO

1st place replaced by 3rd
2nd place replaced by 4th
3rd place replaced by 1st
4th place replaced by 5th
5th place replaced by 2nd place
so the sequence is option 2.
DFBCE is the answer.

Like? Yes (1) | No   

dhanababu   9 years AGO

6 3 5 4 2 b c d e f
5 2 6 3 4 d f b c e

Like? Yes (1) | No   

RANJAN FADIA   9 years AGO

63542=BCDEF then
52634=DFBCE
(co-relate respective digit position with alphabet)
it is ans..

Like? Yes (1) | No   

MRITUNJAY   9 years AGO

arrange according to above series

6 3 5 4 2

5 2 6 3 4
similarly
d f b c e

Like? Yes (1) | No   

deepthi   9 years AGO

6 3 5 4 2 = 5 2 6 3 4 (Rearranged)
| | | | | | | | | |
B C D E F = D F B C E

Like? Yes (1) | No   

premlata   9 years AGO

6=B,3=C,5=D,4=E,2=F
For 52634 it is DFBCE
so, answer is option 2

Like? Yes (1) | No   

Meenakshi   9 years AGO

The number 6 3 5 4 2 equals 5 2 6 3 4

Similarly B C D E F equals D F B C E

option 2)

Like? Yes (1) | No   

sravana   9 years AGO

because in the given example 6 is written in 3 rd position and 3 is written in 4 th position like that 5_1 st position,4-5,5-2.so bcdef written as dfbce.

Like? Yes (1) | No   

arju mishra   9 years AGO

Rrplace letters according to the positions of numbers given.

Like? Yes (1) | No   

Abhay Gawade   9 years AGO

As per sequence given in query.. I followed same sequence : 3 5 1 2 4

Like? Yes (1) | No   

Aman   9 years AGO

6=B,3=C,5=D,4=E,2=F,,,
For 52634 it is DFBCE .that's it..
option 2

Like? Yes (1) | No   

Nishchi   9 years AGO

6 and 5 are shuffled therefore ans will be
d f b c e

Like? Yes (1) | No   

shyam J   9 years AGO

by referring the given sequance code

at positiin 1(B) should come in 3rd the answer
at positiin 2(C) should come in 4th

at positiin 3(D) should come in 5th position. .. like that if we rearrange the given letters tgen we will get DFBCE

Like? Yes (1) | No   

Ann Theressa   9 years AGO

The value in the 1st place moves to 3rd place
value in the 2nd place moves to the 4th place
value in the 3rd place moves to the 1st place
value in the 4th place moves to the 5th place
and value in the 5th place moves to the 2nd place

Like? Yes (1) | No   

Abinash Swain   9 years AGO

according to the serialization it placed.
ex-1'2'3'4'5 is relocated like 3'5'1'2'4.
so it will be like the above
DFBCE

Like? Yes (1) | No   

vimal tiwari   9 years AGO

take B as 6
C as 3.
D as 5
E as 4
F as 2

arrange alphabets in 5 2 6 3 4

option 2 is the ans

Like? Yes (1) | No   

anushka bansal   9 years AGO

if we compare both the numbers
6 and 5 have exchanged their positions therefore B and D exchange their positions
3 goes to the 4th position so C comes in place of E
4 goes to the 5th position so E comes in place of F
2 goes to the 2nd position so F also jumps to the 2nd position

Like? Yes (1) | No   

Pratyusha Payoswini Pradhan   9 years AGO

The letters must be transposed in the same order as the numbers.

Like? Yes (1) | No   

SHUBHAM   9 years AGO

observing at the respective positions occupied by the alphabets, the respective position of numerals can be estimated

Like? Yes (1) | No   

ramakrishnateja   9 years AGO

here 1st&3rd are exchanged.2nd num is in 4th positionn. but 4th=5th position. 5th num is in 2nd posn. use this approach to letters. hence D F B C E

Like? Yes (1) | No   

JENSI KARUNYA.S   9 years AGO

in 63542=52634,the order of numbers is 3rd,5th,1st ,2nd&4th digit of the given number
likewise, BCDEF=DFBCE,Thus the correct option is 2)

Like? Yes (1) | No   

himanshu jaiswal   9 years AGO

6=B,3=C,5=D,4=E,2=F,,,
For 52634 it is DFBCE.that's it..

Like? Yes (1) | No   

om prakash singh   9 years AGO

as the no are arranged in that they are changed their position same as that i changed the position

Like? Yes (1) | No   

Naveen Patel   9 years AGO

if 6 3 5 4 2
=B C D E F

then 5 2 6 3 4
=D F B C E
so ,option 2 is correct.

Like? Yes (1) | No   

onkar   9 years AGO

like we change the places of no. same as thad we changes the places of aphabets

Like? Yes (1) | No   

Arun Sajeevan   9 years AGO

Digit also changed as no changes as 5 the become 2 and and3 rd become 1 st

Like? Yes (1) | No   

sireesha.yammanuru   9 years AGO

As given how the numbers are jumbled,
simlilarly the letter's positions also will be jumbled.
thus Ans : D F B C E

Like? Yes (1) | No   

Dhanunjay   9 years AGO

according to the jumbling of number i had jumbled the letters

Like? Yes (1) | No   

Isha Saxena   9 years AGO

just moving the elements as shown in the example give we get BCDEF=DFBCE

Like? Yes (1) | No   

19 Oct 2015 Sequence

What is X?
24 81 63 26 412 8 25 X

OPtion

1) 3
2) 4
3) 5
4) 6
5) 8
6) 7
7) 2
8) 1
9) 9
10)None of these

Solution

The series is spaced incorrectly. When the spacing is correct it becomes:
2 4 8 16 32 64 128 256,

which is an obvious doubling-up series.

Option 4) 6

Correct Option: 4 Best Solution (7)

Chandrajeet Yadav   9 years AGO

24 81 63 26 412 8 25 X

After omitting the space between numbers we get
24816326412825X

Here we can see that series is in GP with common ratio = 2
So after arranging accordingly we get
2 4 8 16 32 64 128 25X

So the last term (25X) must be 128*2 = 256
And now we can see easily that X = 6
Now series become as follows-
24 81 63 26 412 8 25 6

Option (4

Like? Yes (10) | No (1)  

kriti kankariya   9 years AGO

24 81 63 26 412 8 25 = 2 4 8 16 32 64 128 256
multiplying by 2 at every step
so ans is 6

Like? Yes (3) | No   

NAVEEN KUMAR   9 years AGO

2..2*2(4)--4*2(8)8*2(16)16*2(32)32*2(64)64*2(128)128*2(256)......6(ans)

Like? Yes (3) | No   

MRITUNJAY   9 years AGO

2 4 8 16 32 64 128 256

so 6 is the right answer

Like? Yes (1) | No   

RAHUL KUMAR   9 years AGO

2 4 8 16 32 64 128 256
so the X is 6
option (4) is right.

Like? Yes (1) | No   

Ann Theressa   9 years AGO

The sequence is 2 4 8 16 32 64 128 256 ( 2^1 2^2 2^3 2^4 2^5 .... )

Like? Yes (1) | No   

Nandkishor jaiswal   9 years AGO

if we adjust each term then we it in the power series of 2 that is
2 4 8 16 32 64 128 256
so missing term is 6

Like? Yes (1) | No   

16 Oct 2015 Distance from sun rays

Two poles of height 12 m. and 4 m. are situated in such a way that the sun rays through the top of a pole also passes through the top of other. The distance between poles is? (It is given that the sun rays make an angle of 45 degree with the horizon)

OPtion

1) 10
2) 4
3) 6
4) 12
5) 11
6) 9
7) 7
8) 5
9) 3
10)8

Solution

If we make a triangle from top of the pole of height 12 m. upto ground than an other similar triangle
is also obtained from the top of smaller pole. If distance between the poles is x,
then 12/4 = 12/(12-x)
On solving we get x = 8

Correct Option: 10 Best Solution (15)

ABHINAV PUSHPAM   9 years AGO

Let AB= 12 m and PQ = 4 m
The rays on on the horizon meets at point C . So forms a triangle ABC
Now, In triangle ABC , tan 45 = AB/BC
So, BC = 12
Similarly IN triangle PQC, QC = 4
BQ = BC- QC = 8
OPTION 10)

Like? Yes (10) | No   

Chandrajeet Yadav   9 years AGO

Let requires distance = x
Since angle =45
Then base of the smaller right angle triangle with smaller pole of 4m as perpendicular side = 4m

So, x+4 =12
x = 8
So the distance b/w poles = 8m

Ans= (10

Like? Yes (4) | No   

Nandkishor jaiswal   9 years AGO

the angle is 45 degree
so tan 45=p/b
1=12/b
so b=12
so distance between poles is 12-4
is 8 m

Like? Yes (3) | No   

YASWANTH REDDY   9 years AGO

distance between poles= shadow of long pole - shadow of small pole. As the angle with horizon for both of them is 45degrees, dist between poles = 12-4 = 8m

Like? Yes (3) | No   

PRABHAT KUMAR   9 years AGO

height of 1 pole 12 m
height of 2 pole 4 m
distance between horizon and 2nd pole is y.
tan 45 =4/y
y=4m

distance between 1st pole and 2nd pole x m
tan 45=12/x+y

x =8m
option 10

Like? Yes (3) | No   

Arnab Maity   9 years AGO

tan45 = 12/x
x = 12m
Again, tan45 = 4/y
y = 4m
Therefore distamce between two poles is 12 - 4 = 8m

Answer: option 10) 8

Like? Yes (2) | No   

RANJAN FADIA   9 years AGO

distance of 12m pole from that point where it sun ray touching to ground= 12m
(since two angle of triangle is 45 deg.)

similarly distance of 4m pole from that point where sun ray is touching to ground = 4m also

so diatance b/w both pole = 12-4 = 8m ans.
|
|
|
|
| |
| |
12|4m |

Like? Yes (2) | No   

vikash kumar das   9 years AGO

as tan45=1
therefore in upper triangle
tan45=8/d
and d=8

Like? Yes (2) | No   

Akhil Malhotra   9 years AGO

Using trigonometry:
tan 45=height/base
Hence height=base=4m(for 4m pole) and base=12m(for 12m pole)
Therefore distance between both poles is 12-4=8m

Like? Yes (2) | No (1)  

MRITUNJAY   9 years AGO

height of 1 pole 12 m
height of 2 pole 4 m
distance between horizon and 2nd pole is y.
tan 45 =4/y
y=4m

distance between 1st pole and 2nd pole x m
tan 45=12/x+y

x =8m
option 10

Like? Yes (2) | No (1)  

Aravind   9 years AGO

The sun rays pass through the top of both the poles will hit the ground at some point of time.Hence the path of rays is ABD and will make an angle of 45 with the poles and ground.

D
/|
/ |
B / |12
/4| |
A /__|____ |
C E
angle BAC=45 & DAE=45
tan 45 = opp/adj ==> 1= 4/AC
==> AC=4 & AE=12 CE=8

Like? Yes (2) | No (1)  

sheenu garg   9 years AGO

using trigo base ie distance between poles is 1/sqrt(2)=base/hypotenuse...and using sin we get hypotenuse=8*sqrt(2)since 4 deduct from 12 since other tower is 4 m in height and puuting hypotenuse we get base=8

Like? Yes (1) | No   

s.h.h.praveen   9 years AGO

draw the fig. accordingly and divide it into a rectange and triangle we have triangle length as 4 and want another dimension which gives us answer,by using the angle,tan45=8/x
x=8

Like? Yes (1) | No   

Shubham Raj   9 years AGO

angle made 45 degree is same for both pole that why
base value we get total=12 and second 4
so distance between two poles is=8

Like? Yes (1) | No   

Abhay Gawade   9 years AGO

height of taller pole if earth level increases 4m. = 8m

and angle made by Ray is 45 there for excluding 'karn' remaining sides are of same length.

but height of pole now is 8 m , therefore distance between two poles is also 8 m

Like? Yes (1) | No (1)  

15 Oct 2015 Four digit number

A four digit number having all digit successive when substracted by the number formed by using all the digits in reverse pattern (ie reverse of xyz is zyx) gives a four digit number. The sum of all digits of that number is 18. What will be the product of thousand and units digit of that number

OPtion

1) 0
2) 6
3) 8
4) 18
5) 21
6) 24
7) 30
8) 42
9) 54
10)56

Solution

Let number is 1000x + 100y + 10z + p (i)
its reverse number will be 1000p + 100z + 10y + x (ii)
(ii) - (i) = 999p + 90z - 90y - 999x
999(p-x) + 90(z-y)
999*3 + 90*1 = 2997+90 = 3087
21

Option 5)

Correct Option: 5 Best Solution (9)

bhaskar   9 years AGO

1000(x+3-x)+100(x+2-x-1)+10(x+1-x-2)+(x-x-3)=3087
ans:3*7=21

Like? Yes (5) | No   

Vishal Kumar   9 years AGO

let the digit is 8765 - 5678 =3087 =>3+0+8+7=18
so 3*7=21. Answer is 21

Like? Yes (4) | No   

Meenakshi   9 years AGO

A Four digit number is 3456
Reverse of that number= 6543
=>6543-3456 = 3087
Sum of all digits = 18
3+0+8+7 = 18
so product of thousand and unit digit = 3*7=21
option 5)

Like? Yes (2) | No   

M Narasimhulu   9 years AGO

4321
-1234
3087
21

Like? Yes (1) | No   

MRITUNJAY   9 years AGO

the number is 6543
reverse is 3456
diff = 3087
product is 21

Like? Yes (1) | No   

Robert Yogenson   9 years AGO

suppose digit like=6543
and reverse digit=3456
subtract=6543-3456=3087
and total of 3+0+8+7=18(condition fallow )
then output will be 3X7=21
if you choose another digit then digit will be 7654 and etc

Like? Yes (1) | No   

Satya Samhitha Papineni   9 years AGO

the difference between any four digit number having all digits successive and a number formed by reversing it is 3087
so the product is 21

Like? Yes (1) | No   

harshavi   9 years AGO

by trial method we can guess that the digits should be 3,4,5,6.
so the number should be 6543
by substracting with the reverse of that number w get
6543-3456=2087.
the product of thousands and units digit would be 21

Like? Yes (1) | No   

ABHINAV PUSHPAM   9 years AGO

The number will be 3456. Its reverse will be 6543. Their difference will be 3087. so product of 3*7=21
option 5)

Like? Yes (1) | No (1)  

14 Oct 2015 Radius

A square lawn with side 100 m long has a circular flower bed in the centre. If the area of the lawn, excluding the flower bed is 8614 m^2, the radius of the circular flower bed is

OPtion

1) 11 m
2) 24 m
3) 31 m
4) 48 m
5) 36 m
6) 39 m
7) 41 m
8) 44 m
9) 21 m
10)None of these

Solution

100*100 - Pi r^2 = 8614
Pi r^2 = 1386
r^2 = 441

r = 21
Option 4)

Correct Option: 9 Best Solution (56)

MRITUNJAY   9 years AGO

area of squqre=100*100=10000m^2

area of flower bed=10000-8614=1386m^2

area of circle=1386
pi*r^2=1386
r=21m
option 9

Like? Yes (4) | No (1)  

ABHINAV PUSHPAM   9 years AGO

Area of square = 10000m^2
So, area of circle will be 10000-8614 = 1386 m^2
pi r^2 = 1386
r= 21m
option 9)

Like? Yes (2) | No   

Naveen Kumar   9 years AGO

Area of the flower pot=10000-8614=1386
3.14*r^2=1386
r^2=441
r=21
Radius of the flower pot=21m

Like? Yes (2) | No   

Anuj Dwivedi   9 years AGO

a^2-?r^2=8614
a^2=10000
after solving this we get r=21

Like? Yes (1) | No   

PRAGATHI G   9 years AGO

total area of lawn=100*100=10000m^2
area of circular bed = total area - area of lawn excluding circular bed
area of bed= 10000-8614=1386
pi*r^2= 1386
hence r= radius of circular bed = 21

Like? Yes (1) | No   

Robert Yogenson   9 years AGO

square are=100x100=10000
and flowed area=8614
reaming area=10000-8614=1386
circle area=pieR^2=1386x7/22=441
r^2=441=21

Like? Yes (1) | No   

Nandkishor jaiswal   9 years AGO

area of square =100*100=10000m^2
area of lawn except circle =8614m^2
so area of circle= 10000-8614=1386m^2
from formula:
22/7*r*r=1386
r^2=441
r=21

Like? Yes (1) | No   

Deepanshu Chaturvedi   9 years AGO

area of square-area of remaining part=area of circle
10000-8614=1386=pi*r^2
r=21 m
option 9)

Like? Yes (1) | No   

Gaurab Kumar Jha   9 years AGO

Area of square = 100*100;
Area of circle = 10000-8614;
1386=22/7*r^2;
r^2=1386*7/22;
r^2=441;
r=21

Like? Yes (1) | No   

Gaurav Pratap Singh   9 years AGO

Given side of square=10
area of square=100*100
Area of lawn exluding flower bed=8614
area of flower bed=10000-8614=1386
we know that area of circle=22/7*r^2
1386=22/6*r^2
r=21

Like? Yes (1) | No   

pravallika   9 years AGO

area of circle =area of square - area of circular lawn
=10,000 - 8614
=1386 = pi* radius^2
then radius ^2=441 implies radius of flower bed = 21m.

Like? Yes (1) | No   

Aman   9 years AGO

100*100-3.14*r*r=8614
so 3.14*r*r=1386
r=21
option 9

Like? Yes (1) | No   

Arnab Maity   9 years AGO

Area of the square = 100 * 100 = 10000 Sqm
Area of the flower bed = 10000 - 8614 sqm = 1386
Therefore, Pi * r^2 = 1386
r = sqrt(1386*7/22) = sqrt(441) = 21m

Answer: option 9) 21 m

Like? Yes (1) | No   

Ruby kaushik   9 years AGO

let radius is r
calculate area of lawn(100*100)
and the area of flower bed is - pi*r^2
now given is, 10000- 8614 = pi*r^2

(1387 * 7)/22 = r^2
solving it,
r = 21

Like? Yes (1) | No   

PRABHAT KUMAR   9 years AGO

area of squqre=100*100=10000m^2

area of flower bed=10000-8614=1386m^2

area of circle=1386
pi*r^2=1386
r=21m
option 9

Like? Yes (1) | No   

CHANDAN KUMAR   9 years AGO

area of square = 100×100=1000m^2
area of circular flower bed = (10000-8614)m^2 =1386 m^2

also ,
area of circular flower bed =22/7 r*r

so,
22/7 r*r = 1386 m^2

r =21 m

correct option is 9) 21 m

Like? Yes (1) | No   

aman aditya   9 years AGO

Area of flowered area=10000-8614=1386m^2
so
1386=(22/7)*R*R
r=21m

Like? Yes (1) | No   

Pintu Kumar   9 years AGO

area of squre lawn=(100m)^2=10000m^2
given area of lawn excluding the flower bed=8614m^2
hence the rest of area=(10000-8614)m^2=1386 m^2
we know that area of the circle=pi *r^2
1386m^2=(22/7)*r^2
r=21m

Like? Yes (1) | No   

MD JAVED SALIM   9 years AGO

Area of whole square = 100 × 100 = 10000 sq. m
Area of square excluding flower bed = 8614 sq. m (Given)
Area of flower bed = 10000 - 8614
pi(r^2) = 1386 sq. m
r^2 = 441 sq. m
r = 21 m

Like? Yes (1) | No   

MUTHUKURI SUHAIL   9 years AGO

area of square-area or flower bed=8614
let area of flower bed=x m^2
then 100^2-x=8614
by solving x=1386
here x=area or circular flower bed=?*r^2=1386
by solving r=radius of the circular flower bed=21m

Like? Yes (1) | No   

Sharada   9 years AGO

total area of square including circle at center=100*100=10000m^2
area of circle=10000-8614=1386m^2
area of circle=(22/7)*r^2
(1386*7)/22=r^2
sqrt(441)=r
21=r

Like? Yes (1) | No   

Wakale Pravin   9 years AGO

Area of lawn = 10000,
Area excluding bed= 8614,
Area of bed=10000-8614=1386,

Ï€r*2=1386,

1386/3.14=441,

√441= 21.

Like? Yes (1) | No   

Diksha   9 years AGO

Area of square lawn - area of the lawn excluding circular bed = area of circular bed .
10000-8614=Ï€r^2
Thus r=21

Like? Yes (1) | No   

RUPNARAYAN RANA   9 years AGO

Area of the Square=100*100=10000m^2
Area of circular flower bed=10000-8614=1386m^2
Now, pie R^2=1386
R^2=441
so R=21.
Hence Radius=21

Option (9)

Like? Yes (1) | No   

sudiptaa   9 years AGO

area of square = 10000 m^2
area of circle = 10000-8614 = 1386
radius of circle = 21 m

Like? Yes (1) | No   

karthiga   9 years AGO

Area of Square =10,000(100^2)
Area of Circle = 10000 - 8614 = 1386
22/7 * r^2 = 1386
r = 21

Like? Yes (1) | No   

Tru Jan   9 years AGO

Area of square =100*100 = 10000 m
Area of Flower ( Circular ) bed =22/7 * r*r
Remaining Area = 8614

so Area of Circle = 10000-8614 = 1386
22/7 * r*r = 1386

r=21m

Like? Yes (1) | No   

vimal tiwari   9 years AGO

10000 - 8614 = 3.14 * r * r


r=21 m

Like? Yes (1) | No   

Kalpana Sharma   9 years AGO

area of square-area of circular flower bed=8614
100^2-pi*r^2=8614
10000-22/7*r^2=8614
r=21

Like? Yes (1) | No   

sunil   9 years AGO

total area of lawn - area of lawn excluding circle= area of circle

area of circle =?r square

Like? Yes (1) | No   

Satya Samhitha Papineni   9 years AGO

area of flower bed=10000-8164
so 22/7*r*r=1386
so r=21

Like? Yes (1) | No   

ASHWIN   9 years AGO

Area of square = 100^2=10000.
Area of circle = (10000 - 8614) = 1386.

Therefore, 1386=(22/7)*r^2
(i.e) r^2=7^2*3^2

Hence, r = 21m.

Like? Yes (1) | No   

Bairi Sowjanya Reddy   9 years AGO

let r be radius of circle then,
100^2 - 3.14 r^2 = 8614
r^2 = 441
i.e r=21

Like? Yes (1) | No   

Yadu Vir Singh   9 years AGO

area of square = 100×100
= 10000 m^2

area of circular flower bed = 10000 - 8614
= 1386 m^2

so radius of circular flower bed = 21 m

Like? Yes (1) | No   

K KRISHNA PRASAD NAIDU   9 years AGO

x2=10000
10000-8614=1386
22/7*r2=1386
r=21

Like? Yes (1) | No   

Sai Kiran B   9 years AGO

area of square: s^2= 100 * 100= 10,000
area of circular bed:10000-8614=1386
area of cirlce:
area=pi * r^2
1386=22/7 * r ^2
r^2=441
r=21m
so radius=21m

Like? Yes (1) | No   

rakesh sharma   9 years AGO

100*100-(22/7) r*r=8614
solve it
r=21
answer

Like? Yes (1) | No   

NAVEEN KUMAR   9 years AGO

Area of flower bed=10000-8614=1386m^2
Hence,radius=Ï€r^2=2486
===>r=21m

Like? Yes (1) | No   

UJJWAL KAMAR   9 years AGO

Area circle = area square -8614
= 10000-8614
= 1386
Ï€r^2 = 1386
r = √(1386÷π)
= 21

Like? Yes (1) | No   

Mohammad Mustafa   9 years AGO

area of circle = area of entire square lawn (=a^2) - area of lawn without circular bed (= 8614 (given) ) .
now we get , area of circle = 1386 m^2

since area of circle = pie.r^2
on solving,

hence, radius (r) = 21m

Like? Yes (1) | No   

pravin singh   9 years AGO

area of square - area of circle = 8614
100X100 - 3.14xr^2 =8614
r^2=441
r =21 m

Like? Yes (1) | No   

Himanshu Melkani   9 years AGO

100^2=10000
10000-8614=?.r^2
1386/?=r^2
r=21

Like? Yes (1) | No   

Yekollu Muneeswar   9 years AGO

area of square = 100*100=10000 m^2
area of square w/o circular flower bed= 8614 m^2
area of circular flower bed= 10000-8614= 1386 m^2
-> PI * r^2=1386
-> r^2=1386/PI
-> r^2=441.17
-> r= 21 m

Like? Yes (1) | No   

Annareddy Anusha   9 years AGO

area of square=100^2=1000
area remaining after excluding area of lawn=8614
area of lawn=10000-8614=1386
we know area of a circle is (22/7)*r^2 note:pi=22/7
so r^2=(1386*7)/22=>441
so r=21

Like? Yes (1) | No   

Divya Malik   9 years AGO

area of square lawn(100×100) - area of circular bed(22/7 × r ×r) = remaining area(8614)

Like? Yes (1) | No   

Rishu   9 years AGO

area of sq. lawn = 10000 m^2
area of lawn excluding circular flower bed = 8614 m^2
area of circular flower bed = (10000-8614) = 1386 m^2
radius of circular flower bed = sqrt root(1386/pi) = 21

Like? Yes (1) | No   

Arpit   9 years AGO

Total lawn area - area excluding the flower bed = area of flower bed

Like? Yes (1) | No   

Ravneet Kaur   9 years AGO

area of circular flower bed=area of square-given area
area of circle=10000-8614=1386
area of circle=Πr^2
1386*(7/22)=r^2
√441=r
r=21

Like? Yes (1) | No   

vikash kumar das   9 years AGO

area of square-area of lawn excluding flower lawn=area of circular lawn
now are of circula lawn
(22/7)*r^=10000-8614
r=21

Like? Yes (1) | No   

dhanababu   9 years AGO

area of circle a=10000-8614=1386,
r^2=1386/(3.14)
r=21m

Like? Yes (1) | No   

Ajit Singh   9 years AGO

Total area = 8614 + (area of circle)
100*100 = 8614 + (pi*r*r)
10000-8614 = (22/7)*r*r
on calculating.....

r=21

Like? Yes (1) | No   

A janani hariprasad   9 years AGO

actual area=10000 m2.
difference=1386
from area of circle,r=21m

Like? Yes (1) | No   

Shobhit sengar   9 years AGO

area of Lawn = 100x 100
=10000m^2
area of circular ring = 1000-8614
=1386
so radius = root(1386÷ 3.14)

Like? Yes (1) | No   

s.h.h.praveen   9 years AGO

area of square lawn -area of circular flower bed =8614m^2
(100)^2-pie.r^2=8614
r=21.0m

Like? Yes (1) | No   

Yadu Vir Singh   9 years AGO

area of square = 100×100
10000 m^2

area of circular flower bed = 10000 -8614
= 1386 m^2

so, radius of circular flower bed = 21 m

Like? Yes (1) | No   

RANJAN FADIA   9 years AGO

area of sq = 10000m sq
area of circular flower bed= 10000- 8614 =1386 m sq
pi* r^2 = 1386
=> r^2 = 63 * 7
= 9*7*7
=> r = 3*7 = 21 m ans.

Like? Yes (1) | No (1)  

13 Oct 2015 Child age

The average age of a husband and wife was 23 years when they were married 5 years ago. The average age of the husband, the wife and a child who was born during the interval, is 20 years now. How old is the child now?

OPtion

1) 9 month
2) 1 year
3) 3 years
4) 4 years
5) 1.5 years
6) 2 years
7) 3.5 years
8) 6 years
9) 5 years
10)None of these

Solution

Present total age of husband & wife = (2*23 + 2*5) = 56 years
Present total age of husband, wife & child = (3*20) = 60 years
Present age of the child = (60 - 56) years = 4 years

Option 8)

Correct Option: 4 Best Solution (50)

MRITUNJAY   9 years AGO

sum of age of husband and wife 5 years ago=23*2=46
total present age of husband and wife is 46+10=56
sum of age of husband wife and son is =60

age of son is 60-56=4 year

option 4

Like? Yes (11) | No (1)  

SURAN PRASAD PENKE   9 years AGO

Age of husband=H
Age of wife =W
Age of child =C
((H-5)+W-5))/2=23
H+W=56
(H+W+C)/3=20
C=4yr

Like? Yes (6) | No (1)  

ASHWIN   9 years AGO

within 5 years gap, the average would have been 28 for husband and wife and toltal would be 56 but a child made the average as 20 and total as 60 and so 60-56=4 should be child's age.

Like? Yes (7) | No (2)  

UJJWAL KAMAR   9 years AGO

Current avg age= 28
Now let the age of child be x
So
(28+28+x)/3=20
X=4

Like? Yes (6) | No (2)  

MITHLESH KUMAR   9 years AGO

let present age of husband and wife be x and y respectively.
now
avg age before 5 years be
(( x-5)+(y-5))/2=23
x+y=56 -----------(1)

now at present time
age of child be z
avg age of husband, wife, child is
(x+y+z)/3=20
x+y+z=60 ----------(2)
solving 1& 2
z=4
hence age of child is 4 year

Like? Yes (4) | No   

vamsi krishna   9 years AGO

present age of husband & wife= 2x23+2x5 = 56
present age of husband wife & child = 3x20 = 60
therefore present age of child = 60-56 = 4 years

Like? Yes (4) | No (1)  

avinash kumar   9 years AGO

age of child=[(20*3)-(23*2+5*2)]
=60-56 =4yrs

Like? Yes (3) | No   

Deepanshu Chaturvedi   9 years AGO

let husbands age be x years wife's age be y years and childs age be z years
according to question (x-5+y-5)/2=23 and (x+y+z)/3=20 solving we get z=4 years
option 4)

Like? Yes (2) | No   

Anuj verma   9 years AGO

(x+y)/2=23 five years before
today each of husband and wife age will be increased by 5 ,so total increase of 10 so (x+y+z+10)/3=20 .on solving above and below eq we get z=4 ,which is the age of child.

Like? Yes (2) | No   

Aman   9 years AGO

Sum of present ages of husband and wife = 2 × 23 + 2 × 5 = 46 + 10 = 56
Sum of the present ages of husband, wife and the child = 3 × 20 =60
Therefore, the age of the child = 60 – 56 = 4 years

Like? Yes (2) | No   

RUCHALI RAJ   9 years AGO

let husband age is h
let wife age is w
let child age is c
5 years ago,
(h+w)/2=23 => h+w=46
present age => h+w=56
(h+w+c)/3=20
c=60-56 =4 years

Like? Yes (2) | No   

Anuj Dwivedi   9 years AGO

total age of husband wife 5 year ago is 23*2= 46
and after 5 year and age increased by 5 year both and total age 56 year
and average age of 3 ppl is 20 so total 60 year hence child age =60-56=4 year

Like? Yes (1) | No   

aman aditya   9 years AGO

5 year ago sum of husband and wife=23*2=46
sum of age of husband, wife,child=20*3=60
sum of husband and wife now=28*2=56
so age of child=60-56=4

Like? Yes (1) | No   

YASODA SURENDRA   9 years AGO

Present:-
Age of husband=h
Age of wife=w
Age of child=c
5 years ago:-
Age of husband=h-5
Age of wife=w-5
(((h-5)+(w-5))/2)=23
h+w=56
((h+w+c)/3)=20
h+w+c=60
=>c=60-56
c=4 yrs

Like? Yes (1) | No   

Bairi Sowjanya Reddy   9 years AGO

let present age of wife ,husband,child be w,h and c respectively
then 5 years ago,
husband's age=h-5 and wife's age=w-5
avg of both 5 years ago is 20
therefore ,(h-5+w-5)/2=23
h+w=23*2+10=56
given avg o all the three now is 20
therefore, (h+w+c)/3 = 20
then h+w+c =60
c=60-56 =4

Like? Yes (1) | No   

SHAIK MAHABOOB BASHA   9 years AGO

Sum of present ages of husband and wife = 2 × 23 + 2 × 5 = 46 + 10 = 56
Sum of the present ages of husband, wife and the child = 3 × 20 =60
Therefore, the age of the child = 60 – 56 = 4 years

Like? Yes (1) | No   

sivaswamy cheduluri   9 years AGO

h=husband,w=wife,c=children
h+w/2=23
h+w+c/3=20
solve the above equations we get c=4years

Like? Yes (1) | No   

alpesh kurhade   9 years AGO

Sum of present ages of husband and wife = 2 × 23 + 2 × 5 = 46 + 10 = 56
Sum of the present ages of husband, wife and the child = 3 × 20 =60
Therefore, the age of the child = 60 – 56 = 4 years.

Like? Yes (1) | No   

chetan   9 years AGO

let x is husband and y is wife.
Given that average of their age is 23 years.
so (x+y)/2=23----(1)
when 5 years back so add 5 yrs.
x+y=56.
Let z is child.Given that x+y+z=3*20.
x+y+z=60------(2)
solving 1 & 2 we get z=4.
So option 4 is correct.

Like? Yes (1) | No   

EMANDI KETHAN KUMAR   9 years AGO

x+y=46 when married
x+y=51 now
child age =(20*3)-51-5=4 years

Like? Yes (1) | No   

RUPNARAYAN RANA   9 years AGO

present total age of husband and wife=56
present age of hus,wife & child=60
so child=4

Like? Yes (1) | No   

ramakrishnateja   9 years AGO

(h-5)+(w-5)/2=23. hence h+w=56.( h+w+c)/3=20.(it is given)
so h+w+c=60. c=60-(h+w)=60-56=4yrs.

Like? Yes (1) | No   

Pintu Kumar   9 years AGO

before 5 year avg of both 23*2=46
present year avg of both =46+(5*2)=56
total age of all=20*3=60
age of child=60-56=4

Like? Yes (2) | No (1)  

Devendra Marghade   9 years AGO

Total present age of husband & wife=2*23+2*5=56 years
If present ageof child=x, then (56+x)/3=20, x=4
Option 4)

Like? Yes (1) | No   

sudiptaa   9 years AGO

Sum of present ages of husband and wife = 2 × 23 + 2 × 5 = 46 + 10 = 56
Sum of the present ages of husband, wife and the child = 3 × 20 =60
Therefore, the age of the child = 60 – 56 = 4 years

Like? Yes (1) | No   

Deepak Kumar   9 years AGO

Sum of present ages of husband and wife = 2 × 23 + 2 × 5 = 46 + 10 = 56
Sum of the present ages of husband, wife and the child = 3 × 20 =60
Therefore, the age of the child = 60 – 56 = 4 years. Ans.

Like? Yes (1) | No   

RAGHUNANDAN H M   9 years AGO

5 yrs ago,H+W=23*2
PRESENT, H+W=46+10=56
PRESENT,H+W+C=20*3=60
C=60-56=4YRS

Like? Yes (1) | No   

vikash kumar das   9 years AGO

as the sum oc age of husband and wife 5years ago is=23*2=46
5 years later it will be 56 year.
then the age of child=3*20-56=4years

Like? Yes (1) | No   

Ashutosh   9 years AGO

lets wife age=x, husband=y and child age=z
so x+y=2*46
after five years avg become
(x+5+y+5+z)/3=20
on solving above equations we will get Z=4

Like? Yes (1) | No   

vinay Kumar   9 years AGO

h+w/2=23, h+w=56.present age
h+w+c/3=20 h+w+c=60
60-56=4 ans

Like? Yes (1) | No   

Deepak   9 years AGO

(Husband -5 + wife -5 ) / 2 = 23, -5 because there were married 5 years ago
H + w = 56,

now the average age of the family, (H + W + C)/3 = 20, or c = 4 years.

Like? Yes (1) | No   

Abhisheak Kumar Missu   9 years AGO

Present average age of the husband and the wife=28*2=56 years
Present average age of the husband, the wife and a child=20*3=60 years
Since the age of child=4 years

Like? Yes (1) | No   

saptadeep saha   9 years AGO

father= x, wife=y, son = z
so, x+y=46
again after 5 yrs, (x+5)+(y+)+z=60
solving, x+y+z=50
so z=4 (since x+y=46)

Like? Yes (1) | No   

rakesh sharma   9 years AGO

(a+b)/2=23
a+b=46(before 5 year)
after 5 yr.=>a+b=56
now a+b+c=3*20
56+c=60
c=4
so answer option 4 is true

Like? Yes (1) | No   

KUMAR RAJAT   9 years AGO

total age 5 years before=23*2=46
present age =46+2*5=56
Present total age+20*3=60
so age of child=60-56=4 years

Like? Yes (1) | No   

deepthi   9 years AGO

average of H,w =23 before 5 years
now sum of their ages is 46+10=56
average with new born is 20
son age = 3*20-56=4

Like? Yes (1) | No   

Kalpana Sharma   9 years AGO

((h-5)+(w-5))/2=23
h+w=56
now,
(h+w+c)/3=20
h+w+c=60
56+c=60
c=4

Like? Yes (1) | No   

PRAGATHI G   9 years AGO

present ages h,w,c
(h-5)+(w-5) =(2*23)
h+w+c= 3*20
c=4

Like? Yes (2) | No (1)  

CHITHRA V K   9 years AGO

5 years before avg =23. so total age =46
So now avg = 20
total age = 20 * 3 =60
total age of husband and wife now = 46 + 10 =56
60 -56 =4

Like? Yes (1) | No   

YASWANTH REDDY   9 years AGO

let Husband's age be H and that of wife be W now.
Then before 5 yrs, their ages will be H-5 and W-5 and avg is (H+W-10)/2 = 23. therefore we get H+W = 56
Now, as per the given info, (H+W+C)/3 = 20.
After solving these two eq.s, we get C = 4yrs

Like? Yes (1) | No   

karthiga   9 years AGO

At Present H+W age is 56;
F+W+S = 60;
S=60-56=4;

Like? Yes (1) | No   

ranjit   9 years AGO

5 Year ago
(H-5)+(w-5)=23*2
Now
H+w+c=20*3
So c is 4 years

Like? Yes (1) | No   

rahul kumar   9 years AGO

Let their current age be h,w.
so, their age five year ago are,
(h-5),(w-5);
=> (h-5)+(w-5)/2=23,
=>h+w=56,
now the current avg. of these 3 are 20.
=> (h+w+c)/3=20
(56+c)=60;
=> c=4.
so the age of child is 4 years

Like? Yes (1) | No   

Chirag   9 years AGO

(h-5+w-5)/2=23
h+w=56
(h+w+c)/3=20
c=4

Like? Yes (1) | No   

rohit gandupalli   9 years AGO

Sum of present ages of husband and wife = 2 × 23 + 2 × 5 = 46 + 10 = 56
Sum of the present ages of husband, wife and the child = 3 × 20 =60
Therefore, the age of the child = 60 – 56 = 4 years.

Like? Yes (1) | No   

kirtesh thakre   9 years AGO

23*2+5*2=56
20*3=60
60-56=4 year child age

Like? Yes (1) | No   

santhosh   9 years AGO

let husband age be x
wife is y
child is c
given x+y-10=23*2
x+y=56
x+y+c=20*3
c=4

Like? Yes (1) | No   

Meenakshi   9 years AGO

Age of child = [(20*3)-(23*2+5*2)] years
= 4 years
option 4)

Like? Yes (1) | No   

reena   9 years AGO

h+w/2=23
23*2+5*2=56

h+w+c/3=20
56+c=66
c=4

Like? Yes (1) | No   

premlata   9 years AGO

let husband's present age = x
wife's present age = y
Child's age = w

5 yrs ago avg. age was 23 yrs
so, present avg. age should be 28 and x+y=56
now , present avg. of all three -> (x+y+w)/3 =20 (given)
(56+w)/3=20
so, w=4
Hence child's present age is = 4 yrs.

Like? Yes (1) | No (1)  

12 Oct 2015 Number

What will be 80% of a number whose 200% is 90.

OPtion

1) 144
2) 136
3) 172
4) 72
5) 36
6) 54
7) 96
8) 124
9) 84
10)None of these

Solution

Let 200% of x = 90
then x = 45
Number = 45
Now 80% of 45
80/100 * 45 = 36
Option 5)

Correct Option: 5 Best Solution (77)

Aman   9 years AGO

200% of a number is 90, so 100% of a number is 45, so 45 is 80% of a number
therefore a number is 45/80*100=3600/100
36
so option 5

Like? Yes (13) | No (2)  

Vishal Kumar   9 years AGO

Ans: 36
90 is the 200% so that the number is 45.
80% of 45 is 36 so that the answer is 36.

Like? Yes (10) | No (3)  

PRAGATHI G   9 years AGO

let the numb be x
2*x=90
.8*x=y
by cross multiplication y=36

Like? Yes (7) | No   

Meenakshi   9 years AGO

Let the number be x
200% of x = 90
200/100 (*) x = 90
then x=45
So,80% of 45=36
answer is 36
option 5)

Like? Yes (7) | No   

sudiptaa   9 years AGO

2x = 90
x = 45

80 * 45 /100 = 36

Like? Yes (6) | No   

MADHUBABU   9 years AGO

2x = 90
x=45
therfore 0.8x = 0.8*45 = 36

Like? Yes (4) | No   

Dwaipayan Goswami   9 years AGO

200% of a number = 90
100% of this number =(90/2) = 45
So, 10% of this number = (45/10)= 4.5
Then 80% of this number will be (4.5*8)=36.

Like? Yes (3) | No   

MANUPOTI ANAND   9 years AGO

(x*200)/100=90
x=45
(45*80)/100=36

Like? Yes (3) | No   

SURAN PRASAD PENKE   9 years AGO

(200/100)*X=90
X=45
80% OF X IS
(80/100)*45=36

Like? Yes (3) | No (1)  

SHAIK MAHABOOB BASHA   9 years AGO

let the number be x
200% of that number be x=90
x=100/200*90=45
80% of that number =80/100*45=36

Like? Yes (4) | No (2)  

SUNITEE GARIMA   9 years AGO

let the number be x
A/q,200% of x=90
or,x=45
to find 80% of x
=80% of 45
=36

Like? Yes (2) | No   

karthiga   9 years AGO

Let the number be x;
200% of the number is 90;
200x/100 =90;
X = 45;
80*45 /100 = 36;

Like? Yes (2) | No   

sri divya   9 years AGO

the number is same for both so first find the no. x then find 80% of that x

Like? Yes (2) | No   

Ramya   9 years AGO

200% is 90
so
100% is 45
80% of 45 is 36

Like? Yes (2) | No   

sheenu garg   9 years AGO

let no=x means x*200/100=90 solving x=45
thus 45*80/100=36

Like? Yes (2) | No   

praveendas   9 years AGO

(200/100)*x=90
x=45.
(80/100)*45=36.
option 5

Like? Yes (2) | No (1)  

rahul shaw   9 years AGO

200%=90 then
100%=45
80%of 45 is 36
option 5

Like? Yes (2) | No (1)  

samita mandal   9 years AGO

let the no. be x
200% of x =90
so,x=45
80% of 45= 36
option 5

Like? Yes (2) | No (1)  

Deepak kumar singh   9 years AGO

let no is x
x*200%=90
thrfr x=45
thn 45*80%=36

Like? Yes (2) | No (1)  

ANKUR BAJWA   9 years AGO

suppose numberb is x
then 200% of x=90
so (200*x)/100=90
so x=45
then 80% of 45=36(ans.)

Like? Yes (1) | No   

Arnab Maity   9 years AGO

200*x = 90* 100
x = 45
Now, ( 80 / 100 ) * 45 = 36
Answer : option 5

Like? Yes (1) | No   

Arpan Ganguly   9 years AGO

let no is x ... 200% of x = 2x is 90..so x is 45
now 80% of x means 80% of 45 = 36
option 5 is correct

Like? Yes (1) | No   

chetan   9 years AGO

Suppose the no is x.
Given that 2*x=90 then x=45.
80% of 45 is 0.8*45=36.
So Option 5 is correct.

Like? Yes (1) | No   

M SEKHAR   9 years AGO

let the require number be x
so
200 % of x = 90
200/100 * x =90
x=90/2 =45
x=45
80% of the number =45* 80/100 =36
so option 5 is right one

Like? Yes (1) | No   

himanshu jaiswal   9 years AGO

given 200% of any no is 90
so 90=(200*x)/100=45
so 80% of 45=45*80/100=36

Like? Yes (1) | No   

ranjit   9 years AGO

No. Is (90/200)*100
80% of above no is .8*45
Ans) 36

Like? Yes (1) | No   

K KRISHNA PRASAD NAIDU   9 years AGO

(200/100)*x=90
x=45
(45*80)/100=36
option 5

Like? Yes (1) | No   

pushpank thakur   9 years AGO

x * 200% = 90
x= 9000/200
x = 45
45*80/100=36

Like? Yes (1) | No   

DEEPAK PRASAD   9 years AGO

The 200% is 90 then 100% is 90/2=45. now the 10% is 4.5. So, 80% =4.5*8=36.

Like? Yes (1) | No   

sumit kumar   9 years AGO

let no is x.
then x*200/100=90
x=45
after that 45*80/100
no is 36.

Like? Yes (1) | No   

Chandrajeet Yadav   9 years AGO

let the required number is x
x*(200/100) = 2x
but 2x = 90
so x = 45
x * (80/100) = 45 * (0.8) = 36.0

So correct Ans is option (5

Like? Yes (1) | No   

Naveen Kumar   9 years AGO

100% of 90=45
so 10%=4.5
therefore 4.5*8=36
option 5 is correct

Like? Yes (1) | No   

ramakrishnateja   9 years AGO

let the num be x.200% of a num is 200*x/100=90 hence x is 45. then 80%(x)=80*45/100=36.

Like? Yes (1) | No   

NAVNEET PATIL   9 years AGO

200%=90
100%=45
20%=9
45-9=36

Like? Yes (1) | No   

Yashi Das   9 years AGO

If 200% of a number is 90, the the number is 45.
hence, 80% of 45 is 36

Like? Yes (1) | No   

Kethineni Vinodh   9 years AGO

200% is 90
100% is 45
10% is 4.5
80% is 36

Like? Yes (1) | No   

ankit chavhan   9 years AGO

200/100 * x= 90
X =45

Now 45*80/100 = 36

Like? Yes (1) | No   

RAJASEKHAR VALLE   9 years AGO

Let the no be X.
(200/100)X equals to 90. that is X EQUALS TO 45. Then 80% of X EQUALS to (80/100)45.Therefore the required and is 36

Like? Yes (1) | No   

Dileepkumar Palli   9 years AGO

As per Question
x*200%=90
=>x=90*100/200=45
now, 80% of x is
45*80/100=36

Like? Yes (1) | No   

Pintu Kumar   9 years AGO

let no is X.
x=(200*90)/100
X=180
hence 80% of 180 will be
=(180*80)/100
=144
hence X=180-144=36

Like? Yes (1) | No   

rohit gandupalli   9 years AGO

2x=90
x=45
80%(x)=4/5*(45)
=36

Like? Yes (1) | No   

Sai Kiran B   9 years AGO

200% is 90 : number will be 90
100 % of 90 is 45
45/100 * 80= 36

Like? Yes (1) | No   

CHANDAN KUMAR   9 years AGO

let the no. be x
(200 *x)/100 =90
x=45

according to que,
(45 *80)/100 =36
hence , the correct option is 5) 36 .

Like? Yes (1) | No   

tripti dwivedi   9 years AGO

let the no. is x
200% of x=90
so,x=45
now
80% of 45=36
so 36 is the answer

Like? Yes (1) | No   

krishnaveni   9 years AGO

let the number be x
given 200% of a number x is 90
x=(90*100)/200 =45
x=45
80% of 45 is= (80*45)/100
=36 is the answer

Like? Yes (1) | No   

vinay Kumar   9 years AGO

200% of x=90
100% of x=45
10% of x=4.5
so 4.5*8=36 ans

Like? Yes (1) | No   

vikash kumar das   9 years AGO

200x/100=90
x=45
therfore
45*80/100=36

Like? Yes (1) | No   

Betanapalli Tirupathi   9 years AGO

let number be x
then x*200/100=90 we will get x=45
80%of 45 is 36

Like? Yes (1) | No   

subbulakshmi   9 years AGO

200% of x=90
x=45
80% of 45=36
so ans is 36

Like? Yes (1) | No   

Deepak Kumar   9 years AGO

Let be a no. x
x*200/100=90
x=45
so,
x*80/100=36

Like? Yes (1) | No   

Sushant Kumar   9 years AGO

Let be a no. x
x*200/100=90
x=45
so,
x*80/100=36

Like? Yes (1) | No   

Akshay Bhandakkar   9 years AGO

Let x be the number.
(200/100)*x=90.

So,x=45.

80% of 45 is (80/100)*45=36.

Like? Yes (1) | No   

meghana   9 years AGO

a/c to given data
2*p=90
p=45
so
80% of 45 is 36

Like? Yes (1) | No   

monica anandhan   9 years AGO

2X/100=90
x=4500
80%=0.8x/100
0.8*4500/100=36

Like? Yes (1) | No   

Hetain Chopra   9 years AGO

200/100*x=90
x=45
So 80% of 45 = 36
Hence answer will be 36

Like? Yes (1) | No   

karthik hariharan   9 years AGO

num is X
200% of X is equal to 90
that is 2X=90
therefore X=45
and,
80% of x is equal to.......
45*(80/100)=36
that is option 5

Like? Yes (1) | No   

YASWANTH REDDY   9 years AGO

let the number be x and given that 200% of x = 90.
Therefore x = 45 and 80% of x = 0.8*45 = 36

Like? Yes (1) | No   

ABHINAV KUMAR   9 years AGO

Let the number be X, 200/100 * X= 90, calculate X, which will be 45, then 80% * 45 = 36 the answer.

Like? Yes (1) | No   

Chandra chur anand   9 years AGO

200*x/100=90
so x=45

80% of 45=36
ans :- 5)

Like? Yes (1) | No   

UJJWAL KAMAR   9 years AGO

Let the no be X
2X= 90
X= 45
Now X's 80% is 4X/5
Which is equal to 36

Like? Yes (1) | No   

NAGA BABU   9 years AGO

100%=45
nd 10%=4.5
20%=9
80%=36

Like? Yes (1) | No   

hemakshi   9 years AGO

200% of x = 90 so solving for x gives x=45 .dn 80% of 45 is 36

Like? Yes (1) | No   

Asif Ahmed Khan   9 years AGO

200% of a number is 90 then 100% of these number is 45..so 36 is the 80% of these number

Like? Yes (1) | No   

shreya chaudhary   9 years AGO

If 200% of a number is 90, the the number is 45.
hence, 80% of 45 is 36

Like? Yes (1) | No   

chandan kumar mania   9 years AGO

200 % ----- 90
1%------- 90/200
80%------===9/20 *80==36

Like? Yes (1) | No   

GAJJALA LAKSHMI SRIJA   9 years AGO

The 200% of a number consider x is 90=(200/100)*x=90
Hence x=45
80% of a number=80% of x=(80/100)*45=36.

Like? Yes (1) | No   

Devendra singh   9 years AGO

x*200/100=90
by this x=45
then 80% of 45 is 36
so answer is 36

Like? Yes (1) | No   

suraj   9 years AGO

200% of X=90
X=45
so, 45*80%
=36

Like? Yes (1) | No   

Naveen   9 years AGO

200% of 4.5 is 90, therefore 1% is 4.5 . which means 80% of 4.5 is 36

Like? Yes (1) | No   

harish   9 years AGO

200*X/100=45

45*80/100=36

Like? Yes (1) | No   

m.sai charan   9 years AGO

2-----90
.8------x
x=.8*90/2
x=36

Like? Yes (1) | No   

Mallikarjuna Reddy   9 years AGO

200% of a number is 90=>100% is 45
the number is 45
80% of 45 is 36

Like? Yes (1) | No   

krishna   9 years AGO

200 90
100 45
80 ?
8*4.5 36

Like? Yes (1) | No   

lavanya lahari   9 years AGO

let x be the number...
200% of x is 90
(200/100)×x=90

x=9000/200=45
80% of x will be 80×45/100=36

Like? Yes (1) | No   

Devendra Marghade   9 years AGO

Number is 90*100/200=45
So its 80%= 45*80/100=36
Option 5)

Like? Yes (1) | No (1)  

Vaithiyanaathan   9 years AGO

200 %=90
100%=45
80%= (80/100) *45
=36

Like? Yes (1) | No (1)  

ABHINAV PUSHPAM   9 years AGO

200% of x = 90
x= 90/2 = 45
Now, 80 % of 45 = 36
Option 5)

Like? Yes (2) | No (2)  

09 Oct 2015 Four digit number

A four digit positive number, when divided by the sum of the four digit of the number given 226 as quotient and 0 as remainder. If thousand place of the number is 4 and units place is 2 then the difference of hundred place and tens place will be

OPtion

1) 0
2) 1
3) 2
4) 3
5) 4
6) 5
7) 6
8) 7
9) 8
10)9

Solution

According to the given condition
1000x + 100y + 10z + p = 226(x+y+z+p)
126y + 216z + 225p = 774x
given x = 4 and p = 2
z = 2646-1264 / 216
Only for y = 9 z = 7
9-7 = 2

Option 3)

Correct Option: 3 Best Solution (18)

premlata   9 years AGO

let number is xyzw
as per given condition x=4 and w=2
quotient =226 and remainder = 0
think about multiple of 226 which will be the number (xyzw)
226 * 22=4972 (satisfying the given conditions)
Hence hundred place number = 9 and tens place number =7
so, difference is 2.

Like? Yes (15) | No   

sheenu garg   9 years AGO

Only for 4 digit no with 4 and 2 at above mentioned places ....means 226 should be multiples by no having 2 or 7 at unit place to get required no thus 226*22=4972 gives required no thus 9-7 =2

Like? Yes (4) | No (2)  

MRITUNJAY   9 years AGO

the required number is 4 9 7 2.
difference is 9-7=2
option 3

Like? Yes (4) | No (2)  

Kethineni Vinodh   9 years AGO

226*22=4972
Required Number is 4972
difference is 9-7=2

Like? Yes (5) | No (4)  

ramakrishnateja   9 years AGO

let num=4xy2 sum=6+x+y. we know that div= divisor*quo +rem. 4xy2 =(6+x+y)*226 +0. 4xy2=1356+226(x+y) for x+y=16 we get same value as 4972.hence diff=2.

Like? Yes (1) | No   

RUPNARAYAN RANA   9 years AGO

Let hundred place and ten place are x and y respectively.
so num will be=4xy2
sum=4+x+y+2=6+x+y,
now a/c to question,
226*(6+x+y)+0=4xy2,
so (6+x+y)=4xy2/226
after solving it by hit and trial method we get number=4972.
hence diff b/w hundred and tens place=2.
option=3

Like? Yes (1) | No   

YASWANTH REDDY   9 years AGO

the four digit no is a multiple of 226 as per the given data. The multiple of 226 satisfying the given conditions is 4972. So the difference of 100's place digit and 10's place digit is 9-7 =2

Like? Yes (2) | No (2)  

Vaithiyanaathan   9 years AGO

(4000+100y+10z+2)/(4+y+z+2)=226
(4002+100y+10z)/(6+y+z)=226
Solving
7y+12z=147
Only y=9
and z=7 satisfies the condition.
Hence y-z=2

Like? Yes (2) | No (2)  

John   9 years AGO

Let the number and its sum be 4ab2 and s, respectively.
Now, 4ab2=s*226
If we try to substitute s as 22 we are most likely to get the product having 4 at thousands place and 2 at ones place. In this case the product is 4972.
Now verify the result by finding sum of the each digit, which is 22.
Hence option 3 is the correct answer.

Like? Yes (1) | No (2)  

Deepak kumar singh   9 years AGO

4xy2/6+x+y=226
to solve this equation by hit and trail method and get the value of x and y.
x=9, y=7
x-y=2

Like? Yes (1) | No (2)  

aniket kumar   9 years AGO

4_ _ 2=226*k
when thousand digit is four
and unit digit is two .thish will be when 226*22=4972
4+9+7+2=22
so
9-7=2

Like? Yes (1) | No (2)  

Arnab Maity   9 years AGO

226* 22 = 4972
So 4+9+7+2 = 22
So the difference between Tenth and unit place is 9 - 7= 2

Like? Yes (1) | No (3)  

MUTHUKURI SUHAIL   9 years AGO

226*x=4--2
by choosing x as 22 we get 4972
hence answer wii be 9-7=2

Like? Yes (1) | No (3)  

Deepak Kumar   9 years AGO

no. is 4972...
4+9+7+2=22
4972/22=226
difference=9-7=2
and is 3) 2

Like? Yes (2) | No (4)  

shashank garg   9 years AGO

x*226=4@@2. so we have to apply hit and trail method so we get 226x22=4972. So difference between hundreds place and tens place will be 9-7=2. option 3 is correct.

Like? Yes (1) | No (3)  

Naveen   9 years AGO

4972 when divided by 22(sum of digits)
gives remainder 0 and quotient 226. Thus the difference between hundreds and tens position is 2 (9-7) which is the answer.

Like? Yes (1) | No (3)  

RANJAN FADIA   9 years AGO

22*226=4972
sum of digit is also = 22
so 9-7=2 ans.

Like? Yes (1) | No (4)  

PAWAN KUMAR   9 years AGO

The given no is 4972.

Diff of Hundreth and Tenth place = 9-7 = 2.

Like? Yes (3) | No (7)  

08 Oct 2015 Temperature Increase

On increasing the temperature by 30 degree centigrade, rate of a chemical reaction becomes 15.625 times the initial rate. If every 10 degree centigrade increment in temperature makes the similar multiple change (x), then x is equal to

OPtion

1) 0.5
2) 3.5
3) 4.5
4) 1.5
5) 2.5
6) 5.2083
7) 2.705
8) 2.505
9) 5.05
10) 1.25

Solution

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate) Or x3 = 15.625
Or x = 2.5

Option 5)

Correct Option: 5 Best Solution (21)

RANJAN FADIA   9 years AGO

According to the given condition
x . x . x = 15.625 (initial rate)
x^3 = 15.625
x = 2.5

Like? Yes (4) | No   

premlata   9 years AGO

30 degree centigrade = three laps of 10 degree centigrade
Let Initial rate = y

as per the given condition

y . x . x . x= 15.625 . y
x^3 = 15.625
so, x = 2.5

Like? Yes (2) | No   

Robert Yogenson   9 years AGO

(initial rate).x.x.x=15.625
x^3=15.625
x=2.5
because centigrade increment in term of 10

Like? Yes (1) | No   

ABHINAV PUSHPAM   9 years AGO

According to the given condition 
(initial rate) . x . x . x = 15.625 (initial rate)
i.e x^3 = 15.625
=> x = 2.5
option 5)

Like? Yes (1) | No   

RAHUL KUMAR   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x^3 = 15.625
Or x = 2.5

option (5) is the answer.

Like? Yes (1) | No   

RUPNARAYAN RANA   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
, x = 2.5

Like? Yes (1) | No   

Shubham Raj   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
so ,x = 2.5

Like? Yes (1) | No   

Arvind kumar   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

Kunal nemu   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

pushpank thakur   9 years AGO

from question,
If every 10 degree centigrade increment in temperature makes the similar multiple change (x).

On increasing the temperature by 30 degree centigrade, rate of a chemical reaction becomes 15.625 times the initial rate, then
10+10+10=30 means there is 3 slaps
if temp. increased by 10 degree centigrade rate of reaction become x time initial rate
again temp increased by 10 degree centigrade rate of reaction become square of x. at 20 degree centigrade
similarly, at 30 degree centigrade the rate of reaction become cube of x.
cube of x = 15.625
so, x = 2.5

Like? Yes (1) | No   

Amit chaturvedi   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

avinash kumar   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x^3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

sai   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

himanshu jaiswal   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

Ajay Kumar Gupta   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

Deepak Kumar   9 years AGO

0 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

chetan   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

vamsi krishna   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

Aman   9 years AGO

In 30 degree increase in temp. reaction become 15.625
then for 10 degree increase in temp . the reaction become x*x*x=15.625
2.5
option 5

Like? Yes (1) | No   

Yugandhar Bodipeddi   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No   

balakrishna   9 years AGO

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Like? Yes (1) | No