Question

span >A and B together, B and C together and A and C together can complete a piece of work in 18 days, 15 days and 10 days respectively. Find the ratio of the efficiencies of A, B and C, respectively.

A 4:5:7
B 5:6:6
C 4:1:5
D 7:5:4
E 4:2:7
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