Question

A and B together complete a job in 8 days. A alone completes it in 12 days. How many days will B alone take?

Solution

1. A and B's one-day work = 1/8.
2. A's one-day work = 1/12.
3. B's one-day work = 1/8 - 1/12 = 1/24.
4. Therefore, B alone takes 24 days.