Question

A can do a work in 7 days. If B is 40% more efficient to A,then in how many days can B do the same work?

Answer 1

Since B is 40% more efficient than A. So this implies that A takes 40% more time than B.

Hence 7 days is 40% more than the time taken by B.

So 7 = 140% of B

B = 7*(100/140) = 5days.