Fifteen masons can finish a job in 24 days. They work together for 8 days, and then 5 of them leave. In how many more days will the rest finish the job?

Explanation

1. 01

   Whole job = $15 \times 24 = 360$ mason-days. After 8 days, $15 \times 8 = 120$ are done, leaving 240.

2. 02

   10 masons remain, so they need $240 \div 10 = 24$ more days.