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- 6. A can do a work in 21 days and B alone can do it 28 days, they begin the work together, but A left after some days. B completed the remaining work in 21 days. After how many days did A leave ?
A.10
B.8
C.3
D.15
Answer & Explanation
Answer: Option C 
(A+B) 1 day work = {1/21+1/28}=1/12 = 12days is required for A&B
B’S 1 day work = 1/28
B’s 21 days work = 21/28
1 - 21/28 = 7/28 - 1/4
1/4 *12=3 days
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- 7. A is thrice as good work than as B. Together they can finish a work in 6 days.In how many days A alone do the work?
A.6 days
B.10 days
C.13 days
D.2 days
Answer & Explanation
Answer: Option A
Ratio of their work = 1:3
1x+3x=6
4x=6
X=24
24/4=6
6:18
View Answer
- 8. 36 workers can reap a field in 6 days. If the work is to be completed in 4 days, the extra workers required are
A.10
B.25
C.18
D.15
Answer & Explanation
Answer: Option C
M1D1 = M2D2
36(6)=X(4)
=54
Extra required workers are 54-36=18
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- 9. A certain number of men can do a work in 54days. If there were 6 men more it could be finished in 6 days less. How many men were there in the beginning?
A.50
B.48
C.70
D.40
Answer & Explanation
Answer: Option B
m(54) = (m+6)(48)
9m-8m=48
M=48
View Answer
- 10. 10 men can prepare 20 toys in 12 days working 15 hours a day. Then in how many days can 24 men prepare 32 toys working 20 hrs a day?
A.4 days
B.10 days
C.20 days
D.25 days
Answer & Explanation
Answer: Option A
10*12*15/20 = 24*20*x/32
X=4
View Answer
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