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Ramakrishna to Rishu 9 years ago

The ratio of number of balls in bags x, y is 2: 3. Five balls are taken, from bag y and are dropped in bag x. Number of balls are equal in each bag: now. Number of balls in each bag now is?

a) 20 b) 30

Reply Like? Yes (2) | No

Devendra Marghade 9 years ago

25

If initially there were 2a & 3a balls in bag x and bag y respectively, then
3a-5=2a+5
a=10
So number of balls in each bag now=3a-5 or 2a+5 =25

Like? Yes (3) | No

Ramakrishna to Rishu 9 years ago

Q: 3 shirts cost 1000 on purchasing of 3 shirts shop keeper allows one shirt for free of cost. what percent of discount was allowed ? I NEED SHORTCUT METHOD

Reply Like? Yes (2) | No

Devendra Marghade 9 years ago

33.33%

On purchasing of 3 shirt, discount equivalent to one shirt=1000/3 is given, so % discount allowed=100*(1000/3)/1000=33.33

Like? Yes (1) | No

Rishu 9 years ago

25%

mp of 3 shirts=1000
mp of 1 shirt=1000/3
sp of 4 shirts=1000
sp of 1 shirt=1000/4=250
% discount=[(mp-sp)*100]/mp=[(1000/3-250)*100]/(1000/3)=25%

Like? Yes (1) | No

Ramakrishna 9 years ago

Q: the no of toffees shared among A,B,C are in the ration 2:3:4. they exchanged the toffees in different ways among themselves and finally the ratio of no of toffees with them was 5:8:23. if c got 35 more toffees through these exchanges, how many toffees does A have now?

a) 25 b) 35

Reply Like? Yes (2) | No

Rishu 9 years ago

a) 25

let total number of toffees be T
T=2x+3x+4x=9x.....(1)
also
T=5y+8y+23y=36y.....(2)
according to question:
23y-4x=35
x=(23y-35)/4.....(3)
also from (1) & (2),
9x=36y
x=4y.....(4)
from(3) & (4)
4y=(23y-35)/4
16y=23y-35
7y=35
y=5

number of toffees that A have after exchanges=5*5=25

Like? Yes (2) | No

Ramakrishna 9 years ago

Q: A shop keeper marks his goods at 25% above cost price and allows discount of 25% on marked price . what is the over all profit or loss % ?

a) 25% pf b) 25% ls

Reply Like? Yes (1) | No

Rishu 9 years ago

b) 6.25% loss

let cp be x
then mp=x+0.25x=1.25x
sp=1.25x-0.25*1.25x=0.9375x
loss=x-0.9375x=0.0625x
loss%=(0.0625x/x)*100=6.25%

Like? Yes (3) | No

Ramakrishna 9 years ago

Q which of the following is a perfect square?

a) 0.09 b) 8.1 c) 0.025 d) all

Reply Like? Yes (1) | No

Yashi Das 9 years ago

a)0.09 is the answer
sq rt (0.09)= 0.3

Like? Yes (1) | No

Ramakrishna to Devendra Marghade 9 years ago

Q: some boys and girls are standing in a row. the first girl is followed by 1 boy, the second by 2 boys and so on. there are 35 boys and girls in the line

a) how many boys are there b/w position 5 and 17 ?

b) how many girls are there ?

c) how many girls are there b/w position 21 and 30 ?

Reply Like? Yes (2) | No

Rishu 9 years ago

let number of girls be n
n(n+1)/2+n=35
(n^2+3n)/2=35
n^2+3n=70
n^2+3n-70=0
n=7
GBGBBGBBBGBBBBGBBBBBGBBBBBBGBBBBBBB

a) 8
b) 7
c) 1

Like? Yes (2) | No

Ramakrishna 9 years ago

Q: find odd one out

(external hard disk, cd, keyboard, digital camera) ? plz expalin

Reply Like? Yes (3) | No

Yashi Das 9 years ago

keyboard because all other can store data but keyboard is used to input the data.

Like? Yes (1) | No

Ramakrishna to Rishu 9 years ago

Q54: A salesman averages Rs 240 during a normal 40 hour week. During a sale,his rates are increased by 50% What is his commission if he puts in 60 hours during the sale?

A) 540 B) 600

Reply Like? Yes (3) | No

Rishu 9 years ago

A) 540

money earned in 40 hours= Rs 240
money earned in 1 hour=240/40=Rs6
money earned in 1 hour during sales=6+50% of 6=6+3=9
money earned in 60 hours during sales=9*60=Rs 540

Like? Yes (2) | No

Ramakrishna to Devendra Marghade 9 years ago

Q: The internal and external diameter of a hemispherical bowl are 12 cm and 10 cm respectively. The cost of painting the vessel all over @ Rs.0.07/cm² is

A) 29.26 B) 28.26

Reply Like? Yes (1) | No

Devendra Marghade 9 years ago

A) 29.26

Surface area of hemisphere=2*Pi*radius^2
Here outer radius is R=12/2=6 cm. and inner radius r=10/2=5 cm.
So inner & outer surface area of hemisphere=2*Pi*(R^2+r^2)=2*(22/7)*(36+25)=383.428 cm^2
As hemisphere with thickness will also have surface area along the circular base=Pi*(R^2-r^2)
=(22/7)*(36-25)=(22/7)*11=34.571 cm^2
So total surface area of hemisphere to be painted=383.428+34.571=418 cm^2
Cost of painting @ Rs 0.07/cm^2= 418*0.07=29.26 Rs.

Like? Yes (5) | No

Ramakrishna to Devendra Marghade 9 years ago

Q: A factory increased its production of three wheelers from 80000 into the year 1996 to 92610 in 1999. Find the annual rate of growth of production of three wheelers.

a) 5% b) 6%

Reply Like? Yes (1) | No

Devendra Marghade 9 years ago

a) 5%

If % rate of growth per year=r, then 80000[1+(r/100)]^3 =92610
1+(r/100)=Cube root(9261/ 8000)=21/20 ,r=100/20=5

Like? Yes (3) | No

Ramakrishna to Prayosha panchal 9 years ago

Q: Two trains start travelling on the same track towards each other. If 15 minutes before colliding the trains are 55 kms away and speed of one of the trains is 120 kmph, find the speed of the other train.?

a) 100 kmph b) 120 kmph

Reply Like? Yes (1) | No

Rishu 9 years ago

100 kmph

let speed of the other train be x kmph
since the two trains are travelling towards each other so relative speed between them=
(speed of first train)+(speed of second train)=(x+120) kmph
according to question:
55/(x+120)=15/60.....(since time is in minutes)
3300=15x+1800
15x=1500
x=100

Like? Yes (2) | No

Ramakrishna to Devendra Marghade 9 years ago

Q: A man starts going for a morning walk every day. The distance walked by him on the first day was 2 km. Everyday he walks half of the distance walked on the previous day. What can be the maximum total distance walked by him in his lifetime?

Reply Like? Yes (1) | No

Prayosha panchal 9 years ago

This is a question of infinite series
formulla is S= a/1-r

Solving with a=2, r=1/2
S=4

Like? Yes (3) | No (1)

Ramakrishna 9 years ago

Q: A trader has three types of oils of the following quantities: 406 liter, 434 liter and 455 liter respectively. If he wants to fill them separately in tins of equal capacity, what is the least number of tins required?
1) 42 2) 21 3) 7 4) 84 5) None of these

Reply Like? Yes (1) | No

Rishu 9 years ago

5) None of these

HCF(406,434,455)=7
least number of tins required=(406+434+455)/7=185

Like? Yes (1) | No

Ramakrishna to Rishu 9 years ago

pls send ur face book id to my mail----parusharam22mca@gmail.com
i need to send some doubts of arithmetic and reasoning questions..... in this website im unable to sending pics

Reply Like? Yes (2) | No

Rishu 9 years ago

check your mail

Like? Yes (2) | No

Ramakrishna 9 years ago

Q: UMBRELLA is coded as UNCSEMMA then UNIVERSITY is.... I NEED SOLUTION PLS HELP ME

ans) U O I W E S T I Z

Reply Like? Yes (1) | No

TAUSIF MOLLAH 9 years ago

The vowels are not changing. Only the consonants are replaced by the next alphabet.

Like? Yes (2) | No

Ramakrishna 9 years ago

Q: 272, 342,210,155,110,72

find odd man out

Reply Like? Yes (1) | No

TAUSIF MOLLAH 9 years ago

155
Coz this is only odd number in this set.

Like? Yes (2) | No

Rishu 9 years ago

155

272=16*17
342=18*19
210=14*15
155=31*5
110=10*11
72=8*9
all numbers are product of two consecutive numbers except for 155

Like? Yes (2) | No

Rishu 9 years ago

should have given some even number instead of giving 155 which makes answer obvious

Like? Yes (1) | No

Ramakrishna to Rishu 9 years ago

thanks you rishu..........

Reply Like? Yes (2) | No

Rishu 9 years ago

u r welcome

Like? Yes (1) | No

Ramakrishna to Rishu 9 years ago

Q: Find the sum of the first 40 terms of the series 12 - 22 + 33 - 42 + ......

a) 820 b) -820 c) 870 d) -870

Reply Like? Yes (1) | No

Rishu 9 years ago

b) -820

the whole series is like below:
Sn=12-22+33-42+45-62+66-82+78-120+99-122+111-142+132-162+144-182+165-202+.....
the above series consists of three independent series:
(1) it starts from 12 with a common difference of 33 and has 10 terms
Sn1=12+45+78+111+.....=(10/2)*(2*12+(10-1)*33)=1605
(2) it starts from -22 with a common difference of -20 and has 20 terms
Sn2=-22-42-62-82-.....=(20/2)*(-22*2+(20-1)*(-20))=-4240
(3) it starts from 33 with a common difference of 33 and has 10 terms
Sn3=33+66+99+132+.....=(10/2)*(2*33+(10-1)*33)=1815

thus, Sn=Sn1+Sn2+Sn3=1605-4240+1815=-820

Like? Yes (2) | No

Ramakrishna to Rishu 9 years ago

Q HONEST is coded PIFOUT Then WEALTH IS ?

a) FXMBIU b) BIFIMU c) BFIMUX

Reply Like? Yes (2) | No

Rishu 9 years ago

a) FXMBIU

1__H+1=I
2__O+1=P
3__N+1=O
4__E+1=F
5__S+1=T
6__T+1=U
for PIFOUT sequence is 214365
similarly
1__W+1=X
2__E+1=F
3__A+1=B
4__L+1=M
5__T+1=U
6__H+1=I
arranging right hand side in the same sequence(214365), we get:
FXMBIU

Like? Yes (2) | No

Ramakrishna to Rishu 9 years ago

what are the best books for arithmetic maths to prepare central jobs.......pls tell me

Reply Like? Yes (2) | No

Rishu 9 years ago

arun sharma

Like? Yes (2) | No

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