If 36 men can do a piece of work in 25 days, in how many days will 15 men do it?

Explanation

To solve the problem, we will use the concept of inverse variation. The amount of work done is inversely proportional to the number of men working and the number of days taken to complete the work.

### Step-by-Step Solution:

1. **Understand the relationship**: We know that if more men are working, they will complete the work in fewer days. This means that the product of the number of men and the number of days taken to complete the work remains constant.

2. **Set up the equation**: From the problem, we know that:
- 36 men can complete the work in 25 days.
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