Explanation

5 masons can build a house in 120 days.

This means the total work required to build the house is:

5 masons × 120 days = 600 mason-days

To build the same house in 75 days, the total work required remains the same (600 mason-days).

Let's divide the total work by the new timeframe:

600 mason-days ÷ 75 days = 8 masons