10 workers can build a wall in 26 days. How many days will 13 workers take to build the same wall, working at the same rate?

💡 Solution & Explanation

The total work is 10 × 26 = 260 worker-days. More workers means fewer days, so divide: 260 ÷ 13 = 20 days. Multiplying instead (33.8 days) would mean more workers take longer, which cannot be right.