5 men can do a job in 20 days. How many men are needed to complete the job in 10 days?
Correct answer: B. 10
- A. 8
- B. 10
- C. 15
- D. 20
Explanation
To solve this problem, you can use the concept of man-days, which is the product of the number of men and the number of days they work. 5 men working for 20 days means 5 x 20 = 100 man-days are needed to complete the job. If you need to complete the job in 10 days, you need 100 man-days. Therefore, you need 100 man-days / 10 days = 10 men. Option A (8 men) and Option C (15 men) would not provide the exact number of man-days required for completion in 10 days. Option D (20 men) would overshoot the requirement, finishing the job in fewer days than necessary. Thus, Option B (10 men) is correct.
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