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Ramakrishna 4 years ago

Q: Tom is chasing Jerry. In the same interval of time Tom jumps 8 times while Jerry jumps 6 times. But the distance covered by Tom in 7 Jumps is equal to the distance covered by Jerry in 5 Jumps. The ratio of speed of Tom and Jerry is ?

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Rishu 4 years ago

(8*5/(6*7)=40/42

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Rishu 4 years ago

40/42

let distance be d and time interval be t

distance covered by tom in one jump=d/7
distance covered by jerry in one jump=d/5

time taken by tom for one jump=t/8
time taken by jerry for one jump=t/6

speed=distance/time

toms speed=(distance covered in one jump)/(time taken for one jump)
=(d/7)/(t/8)=8d/7t
similarly,
jerrys speed=(d/5)/(t/6)=6d/5t

toms speed/jerrys speed=(8d/7t)/(6d/5t)=40/42

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Ramakrishna 4 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

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Devendra Marghade 4 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

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Ramakrishna 4 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

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Devendra Marghade 4 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

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Rishu 4 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%

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Ramakrishna 4 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

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Rishu 4 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

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Ramakrishna 4 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

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Rishu 4 years ago

check your mail

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Ramakrishna 4 years ago

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

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Rishu 4 years ago

u r welcome

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Ramakrishna 4 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 4 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

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Ramakrishna 4 years ago

Q HONEST is coded PIFOUT Then WEALTH IS ?

a) FXMBIU b) BIFIMU c) BFIMUX

Reply Like? Yes (2) | No

Rishu 4 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

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Ramakrishna 4 years ago

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

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Rishu 4 years ago

arun sharma

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Ramakrishna 4 years ago

Q: Find the sum of the following series 22 + 32 +.......... + 202. I NEED COMPLETE SOLUTION PLS HELP ME

A. 2867 B. 2868 C. 2869 D. 2870

Reply Like? Yes (1) | No

Rishu 4 years ago

202=22+(n-1)*10
180=(n-1)*10
18=n-1
n=19

22 + 32 +.......... + 202=19*(22+202)/2=2128

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ER. Rishu
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Rishu (M)

Total Points 1064
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M4 Score

Score from best 50 Questions

Attempted 50
Date Points

12 Feb 16 16
11 Mar 16 19
15 Mar 16 15
16 Mar 16 15
17 Mar 16 16
18 Mar 16 17
22 Mar 16 15
23 Mar 16 15
24 Mar 16 15
25 Mar 16 19
28 Mar 16 15
30 Mar 16 15
31 Mar 16 15
01 Apr 16 16
05 Apr 16 15
06 Apr 16 15
07 Apr 16 15
08 Apr 16 15
11 Apr 16 15
13 Apr 16 15
14 Apr 16 15
15 Apr 16 15
18 Apr 16 15
19 Apr 16 15
20 Apr 16 15
22 Apr 16 15
26 Apr 16 15
27 Apr 16 15
28 Apr 16 15
29 Apr 16 15
03 May 16 15
05 May 16 15
09 May 16 16
11 May 16 16
25 May 16 15
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19 Aug 16 15
26 Aug 16 15
29 Aug 16 15
31 Aug 16 15
02 Sep 16 15
22 Dec 16 15
23 Dec 16 15
11 Jan 17 15

Total 765
M4 Score765 / 10 = 76

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Rishu (M)

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