16 labourers working 9 hours a day can finish a building's flooring in 20 days. How many days will 24 labourers working 8 hours a day take for the same flooring?

Explanation

1. 01

   Total work = $16 \times 9 \times 20 = 2880$ labour-hours.

2. 02

   New team per day: $24 \times 8 = 192$ labour-hours.

3. 03

   Days = $2880 \div 192 = 15$.