A can do a piece of work in 20 days, while A and B together can do it in 12 days and A, B and C all together can do it in 10 days. In how many days will the work be done if they work for a day in the pattern (A, A and B, A and C, A, .....)?

Question

Accepted Answer

A: 15 days

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A can do a piece of work in 20 days, while A and B together can do it in 12 days and A, B and C all together can do it in 10 days. In how many days will the work be done if they work for a day in the pattern (A, A and B, A and C, A, .....)?