Twelve workers, working 8 hours a day, finish laying a road in 15 days. How many days will 18 workers take for the same job if they work 10 hours a day?

Explanation

1. 01

   Total work = $12 \times 8 \times 15 = 1{,}440$ worker-hours.

2. 02

   18 workers × 10 hours = 180 worker-hours per day.

3. 03

   Days = $1{,}440 \div 180 = 8$.