**1. Mohan and Sohan can do a job in 12 days. Sohan alone can finish it in 28 days. In how many days can Mohan alone finish the work?**

**2.Mary and Maurice can do a piece of work in 10 days and 15 days respectively. They work together for 3 days and then Maurice leaves. Mary finishes the remaining work alone. In how many days is the total work finished?**

**3.A and B can do a piece of work in 12 days, B and C in 15 days, C and A in 20 days. How long would each take separately to do the same work?**

**4.Keberi takes twice as much time as Kanti and thrice as much as kalpana to finish a piece of work. They together finish the work in one day. Find the time taken by each of them to finish the work.**

**5.A, B and C can do a work in 10, 12 and 15 days, respectively. If B leaves after 2 days, how long would it take A and C to complete the remaining work?**

**6.P can do a work in 12 days. Q works 60% more fast then P, then in how many days Q alone would finish the work?**

**7. Suresh can do 3/4 th part of a work in 15 days and Mohan completes the rest part of work in 3 days, in how many days Suresh and Mohan together can finish the work**

**8.Ramesh is thrice as good as workman as Bipan, and is therefore able to finish a piece of work in 40 days less than Bipan, find the time for both together to complete the work**

**9.If 3 men or 4 women can complete a job in 43 days then in how many days 7 men and 5 women can complete the some job?**

**10.If 5 men and 2 Women working together can make bricks four times more than a man and a woman working together. Compare the work of a man with that of a woman.**

**Answers and Solution:**

1.(2)

Mohan and sohan do work in = 12 days

sohan do work in = 28 days

so Mohan do work alone = 1/12 – 1/28 = 1/21 of work

mohan’s alone time = 1/1/21 = 21 days

2.(3)

Mary’s efficiency = 10%

Maurice’s efficiency = 6.66%

Total = 16.66%

Work will be completed in 6 days

Work done in 3 days = 50%

remaining = 50%

Mary will complete the remaining in = 50/10 = 5

Total = 5+3 = 8 days

3.(1)

4.(4)

Let alone time of Kaberi = x,

then alone time of kanti = x/2 and

kalpana = x/3

Kaberi’s 1 day work + kanti’s 1 day work+ kalpana’s 1 day work

=> 1/x + 1/x/2 + 1/x/3 = 1

=> x = 6

so alone time of Kaberi = 6 days

alone time of Kanti = 3 days

alone time of Kalpana = 2 days

5. (1)

6. (4)

p’s 1 day work = 1/12

Q is 60% more fast then p, so Q’s 1 day work = 1.6*1/12 = 2/15

Q can finish alone in 1/2/15 = 15/2 = 7(1/2) days

7. (4)

8. (2)

Since Ramesh is thrice as good a workman as Bipin .So ,if Bipin completes in 3t days,then Ramesh does in t days

so 3t – t = 40

=> t = 20

=> Bipin takes 60 days and Ramesh takes 20 days (Ramesh+Bipin)’s 1 day work

=> 1/60 + 1/20 = 1/15 = 15 days.

9.(1)

10.(1)

(5M +2W)’s 1 day work = (1M +1W)’s 4 day work

5M + 2W = 4(1M+1W)

5M + 2W = 4M + 4W

1M + 2W

M/W = 2/1