Question

A and b can do a piece of work in 45 and 40 days resepctively. They began the work together but a left after some days and b finishsed the remaining work in 23 days. A left after how many days?

Answer 1

Answer:

1/40 *23=23/40

1-23/40=17/40

1/45+1/40=8+9/360= 17/360

17/40//17/360= 360/40=9 days