Question

A and B together can finish a piece
work in 12 days. If 'A' alone can finish
the same work in 20 days, in how
many days B alone can finish it?
​

Answer 1

Answer:

if A and B can complete in 12 days then their one day work= 1/12

so same way A can do it in 20 days

so one day work =1/20

if I want B one day work = one day work of A and B - one day work of A

1/12-1/20

(5-3)/60

2/60

1/30

so B can complete in 30 days