Question

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

Answer 1

you can do it with the formula x1 x2 y1 y2

Answer 2

The amount of work A and B do together is 1/12, as working together, they can finish the work in 12 days. Since, A can finish the work alone in 20 days, the amount of work A dies alone in one day is 1/20. B alone will finish the work in 30 days. A & B can finish the work in 12 days.