Question

span >A and B together, B and C together and A and C together can complete a piece of work in 22 days, 20 days and 12 days respectively. Find the ratio of the efficiencies of A, B and C, respectively.

A 4:5:7
B 26:4:29
C 4:7:5
D 7:5:4
E 4:2:7
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