A and B together can complete a piece of work in 12 days B and C can do it in 20 days and C and A ca...........

Quant (SSC) Time and work

A and B together can complete a piece of work in 12 days, B and C can do it in 20 days and C and A can do it in 15 days. A, B and C together can complete it in

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Explanation:

To solve this question, we can apply a short trick approach;
If A and B can do a piece of work in x days, B and C in y days, C and A in z days, then (A + B + C) working together will do the same work in
[2xyz / xy + yz + zx] days
A and B together finish a piece work = x = 12 days
B and C together finish a piece work = y = 20 days
C and A together finish a piece work = z = 15 days
By the short trick approach:
A, B and C can do the work in