4 men can do a work in 7 days. How many men are required to do it in 4 days?
2024
4 men can do a work in 7 days. How many men are required to do it in 4 days?
- A.
7
- B.
8
- C.
9
- D.
10
Attempted by 166 students.
Show answer & explanation
Correct answer: A
Solution:
Key idea: Work (in man-days) = number of men × number of days.
Compute total work: 4 men × 7 days = 28 man-days.
Find required number of men to finish in 4 days: required men = total work ÷ days = 28 ÷ 4 = 7.
Answer: 7 men are required.
Check: 7 men × 4 days = 28 man-days, which equals the original total work, so the result is correct.