**Question:**

18 men can reap a field in 35 days. For reaping the same field in 15 days, how many men are required?

**Solution:**

Let the number of men required to reap the field in 15 days beĀ *x.*

Since the number of days and the number of men required ro reap the field are in inverse variation, we have:

$35 \times 18=15 \times x$

$\Rightarrow x=\frac{35 \times 18}{15}$

$=42$

Thus, the required number of men is 42 .