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26 . A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take t
 A. 18 days B. 24 days C. 30 days D. 36 days

27 . A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work in :
 A. 4 days B. 6 days C. 8 days D. 18 days

28 . Ravi can do a piece of work in 30 days while Prakash can do it in 40 days. In how many days will they finish it together?
 A. 17 1/7 days B. 27 1/7 days C. 23 2/7 days D. 16 4/11 days

29 . Anil can do a work in 15 days while Sunil can do it in 25 days. How long will they take if both work together?
 A. 3 4/9 days B. 8 4/9 days C. 9 3/8 days D. 6 3/8 days

30 . A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in
 A. 3 days B. 5 days C. 8 days D. 10 days

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