Question

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

Answer 1

Step-by-step explanation:

A+B=12

1/A+1/B=1/12

A=20 GIVEN

1/B=1/12-1/20

1/B=1/30

B=30 ANSWER

Answer 2

Answer:

30

Step-by-step explanation:

A+B in  12 Days can do 1 Work

A+B in 1 day can do 1/12 part

Now A alone in 20 days can do 1 work

A alone in 1 day can do 1/20 part

So B alone in 1 day can do 1/12-1/20= 1/30 part

So, B alone in 30 days can do 1 work. (Ans)