Question

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

Answer 1

Answer:

Let,

A work alone in one day = 1/A= 1/20

A & B together work and complete the work in 12 days

so, 1/A + 1/B = 1/12

1/20 + 1/B = 1/12

1/B = 1/12 - 1/20

1/B = (20-12)/240

1/B = 8/240

1/B = 1/30

B = 30

So, that

B will work alone then, complete the work in 30days

I hope that it will help you

thanx