Question

A and B work together can do a work in 12 days, while B alone can finish it in 20 days .In how many days can A alone finish the work

Answer 1

Answer:

30 days

Step-by-step explanation:

A and B work together can do a work in 12 days. So A and B can complete 1/12th of the total work in one day

B alone can finish it in 20 days. So be can complete 1/20th of the work in one day

So the portion of work A alone can complete in one day = 1/12 - 1/20

=2/60

=1/30

So A alone can complete the work in 30 days