Question

a can complete a work in 20 days and b can complete the same work in 25 days. If both of them work together, then in 3 days what percent of the total work will be completed?

Answer 1

A’s one day work = 1/20

B’s one day work = 1/25

A and B’s one day work = 1/20 + 1/25

5+4/20 = 9/20

Number of days = 20/9

Answer 2

Refer the attachment.