Question

24 workers can build a wall in 15 days. How many days will 9 workers take to build a similar wall?

Answer 1

Number of days taken by 24 workers to build a wall = 15 days
Number of days taken by 1 worker to build the wall = 15 × 24 = 360 days (less worker means more days)
Number of days taken by 9 workers to build the wall = 360 = 40 days
9