21 workers can build a wall in 26 days. How many days will 14 workers take to build the same wall, working at the same rate?

💡 Solution & Explanation

The total work is 21 × 26 = 546 worker-days. More workers means fewer days, so divide: 546 ÷ 14 = 39 days. Multiplying instead (17.33 days) would mean more workers take longer, which cannot be right.