A and B together do a piece of work in 15 days. B can do it alone in `20` days. In how many days can A do it alone.

A and B together can do a piece of work in 12 days and A alone can do it in 18 days. In how many days canBalone do it?

A and B together can do a piece of work in 12 days, while B alone can finish it in 30 days. In how many days can A alone finish the work?

A and B can do a piece of work in 12 days, B and C in 15 days C and A in 20 days. In how many days can C alone do it ?

A and B can do a piece of work in 12 days, B and C in 15 days and A and C in 20 days. In how many days can each alone do the work?

A and B together can do a piece of work in 12 days; B and C can do it in 20 days while C and A can do it in 15 days. A, B and C all working together can do it in