Question 69

A, B and C together can finish a task in 12 days. A is twice as productive as B and C alone can do the task in 36 days. In how many days can A and B do the task if C goes on leave?

Solution

Let say, B can do in x days .

So, A can do in (x/2) days.

So, (1/x+2/x+1/36)=1/12.

or, (1/x+2/x)=(1/12-1/36)=1/18.

So, A and B can do the full work in 18 days.

D is correct choice.

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