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21 . A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?
A. 40 days B. 23 days
C. 35 days D. 42 days

22 . A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was compl
A. 8 days B. 10 days
C. 12 days D. 15 days

23 . A work which could be finished in 9 days was finished 3 days earlier after 10 more men joined. The number of men employed was?
A. 18 B. 20
C. 22 D. 24

24 . A and B can do a piece of work in 7 days. With the help of C they finish the work in 5 days. C alone can do that piece of work in?
A. 1 day B. 10 days
C. 30 days D. 32 days

25 . A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?
A. 45/2 days B. 55 days
C. 65/2 days D. 75/2 days