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471 . A and B can do a work in 12 days, B and C in 15 days, C and A in 20 days. if A, B and C work together, In how many days they will complete the work?
A. 10 Days B. 12 Days
C. 8 Days D. 16 Days

472 . 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 will do this work in -
A. 6 Days B. 8 Days
C. 10 Days D. 5 Days

473 . A can finish a work in 18 days and B can do the same work in 15 days. B worked for 10 days and left the job. In how many days A alone can finish the remaining work?
A. 6 Days B. 5 Days
C. 4 Days D. 8 Days

474 . A can finish a work in 24 days, B in 9 days and Dc in 12 days. B & C start the work but are forced to leave after 3 days. The remaining work done by A in-
A.  8 Days B. 10 Days
C. 6 Days D. 12 Days

475 . A is 30% more efficient than B. a can complete a work in 23 days. If A and B work together, how much time will it take to complete the same work?
A. 10 Days B. 13 Days
C.  12 Days D. 11 Days




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