Time And Work

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21 Ajay can do a piece of work in 25 days and Sanjay can finish it in 20 days. They work together for 5 days and then Ajay goes away. In how many days will Sanjay finish the remaining work?

A
11 days
B
12 days
C
13 days
D
14 days

22 45 people take 18 days to dig a pond. If the pond would have to be dug in 15 days, then the number of people to be employed will be

A
50
B
54
C
60
D
72

23 2 men and 3 women can complete a work in 10 days, while 4 men can complete it in 10 days. In how many days will 3 men and 3 women complete the work?

A
6 days
B
8 days
C
10 days
D
12 days

24 A group of boys can do a certain piece of work in 40 days. If the group had 10 more boys, the work could be done in 5 days less. How many boys are there in the group?

A
50
B
70
C
80
D
90

25 A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days?

A
11 days
B
13 days
C
20 days
D
None of these

26 A can do a piece of work in 10 days, while B can do it in 6 days. B worked at it for 4 days. How long will A take to finish the remaining work?

A
$${\text{5}}\frac{1}{3}{\text{ days}}$$
B
$${\text{6}}\frac{1}{3}{\text{ days}}$$
C
$${\text{3}}\frac{1}{3}{\text{ days}}$$
D
$${\text{4}}\frac{1}{3}{\text{ days}}$$

27 Ten men can do a piece of work in 12 days. How many men are needed to complete the work in 20 days?

A
6
B
3
C
8
D
9

28 11 Sekh can do a work in 15 days and Vimal is 50% more expert than Sekh to complete the same work, then find total time taken to complete the work by Vimal:

A
10 days
B
11 days
C
12 days
D
13 days

29 3 men and 4 boys can complete a certain work in 8 days, while 4 men and 4 boys can complete the same work in 6 days. Then 2 men and 4 boys will finish it in days:

A
24 days
B
8 days
C
12 days
D
10 days

30 A contractor undertook to do a certain piece of work in 18 days. He employed certain number of men but 12 of them being absent from the very 1st day, the rest could finish the work in 30 days. Find the number of men originally employed:

A
40
B
15
C
45
D
30