15 masons can build the wall in 20 days. How many masons will build the wall in 12 days?

Explanation
The rate at which Masons build walls is what we need to understand with this problem. 15*X = 20 15*X/20 = 1 Wall Therefore, a fifteenth of a wall can be built by one mason in 20 days. Each day, a mason can build 1/(15*20) or 1/300th of an entire wall. Therefore, it would take one mason 300 days to build a wall on their own. It would take 15 masons 20 days (300/20) to build a wall. And we can estimate the 12 day solution with the following formula: 300/12 = 25 It would take 25 masons 12 days .