Eight soldiers can dig a practice trench in 15 days. How many soldiers are needed to finish the same trench in 10 days at the same rate?
Q1. Eight soldiers can dig a practice trench in 15 days. How many soldiers are needed to finish the same trench in 10 days at the same rate?
Answer: 12
Explanation: Total work is 8 times 15, which is 120 man-days. Dividing by 10 days gives 12 soldiers.