A is twice as good as workman as B and together they finish a piece of work in 18 days. In how many days will B alone finish the work?

A is twice as good as workman as B and together they finish a piece of work in 18 days. In how many days will B alone finish the work?

Explanation

Let: B= x   and A= 2x

(A+B) 18 days work = 1 

(A + B) one day work= 1/18

So:

x + 2x =1/18

⇒     x =  1/54 

So A=27 and B= 54