12 workers can build a wall in 20 days. How many days will 8 workers take to build the same wall, working at the same rate?

💡 Solution & Explanation

The total work is 12 × 20 = 240 worker-days. More workers means fewer days, so divide: 240 ÷ 8 = 30 days. Multiplying instead (13.33 days) would mean more workers take longer, which cannot be right.