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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

Explanation:(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

- 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

Explanation:Ratio of their work = 1:3

1x+3x=6

4x=6

X=24

24/4=6

6:18

- 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

Explanation:M1D1 = M2D2

36(6)=X(4)

=54

Extra required workers are 54-36=18

- 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

Explanation:m(54) = (m+6)(48)

9m-8m=48

M=48

- 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

Explanation:**10*12*15/20 = 24*20*x/32**

X=4

X=4

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