Question

A is 50% more efficient than B. If B takes 18 days to finish a job, how many days will A take?

Solution

1. If B's efficiency is 100 units, A's efficiency is 150 units.
2. Their efficiency ratio A:B is 3:2.
3. Time is inversely proportional to efficiency, so A:B time ratio is 2:3.
4. A's time = 18 x 2/3 = 12 days.