The number of workers that this architect need to build a 20-story building in a month is approximately 47 workers.
In Mathematics and Geometry, a direct proportion refers to a mathematical equation which is typically used to represent the equality of two (2) ratios.
Note: There are 30 days in one month.
By applying direct proportion to the given information, we have the following mathematical equation:
11 workers = 7 days
x workers = 30 days
By cross-multiplying, we have the following:
7 × x = 30 × 11
7x = 330
x = 330/7
x = 47.14 ≈ 47 workers.
Complete Question:
An architect built an apartment with the help of 11 workers in 7 days. How many workers does he need to build a 20-story building in a month?