If 10 people complete work in 20 days, in how many days can 8 people complete the same work?

If 10 people complete work in 20 days, in how many days can 8 people complete the same work?

Explanation
10 men can complete the work in 20 days.
This means the total work is:
10 men × 20 days = 200 man-days
Now, if 8 men work at the same rate:
200 man-days ÷ 8 men = 25 days