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31 . A and B can do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in :
 A. 4 days B. 6 days C. 8 days D. 12 days

32 . A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?
 A. 21 ½ days B. 22 ½ days C. 23 ½ days D. 12 ½ days

33 . A can do a piece of work in 10 days and B can do it in 15 days and C can do it 20 days. They started the work together and A leaves after 2 days and B leaves after 4 days from the beginning. How long
 A. 8 2/3 days B. 9 2/3 days C. 10 2/3 days D. 10 days

34 . A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in
 A. 24/7 days B. 23/8 days C. 7/24 days D. 8/23 days

35 . A and B together can do a piece of work in 30 days. A having worked for 16 days, B finishes the remaining work alone in 44 days. In how many days shall B finish the whole work alone?
 A. 30 days B. 40 days C. 60 days D. 70 days

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