A and B can finish a work in 20 days . A alone can do `1/5th` of the work in 12 days.In how many days can B alone do it?

A and B can do a work in 8 days and A alone can do it in 12 days. In how many days can B alone do it?

Aman and Raman together can do a work in 10 days. Aman alone can do the work in 12 days. In how many days Raman alone can do the work?

A and C can do a work in 12 days while A,B and C can do the work in 4 days. In how many days can B do the work 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?