20 men can construct a building in 40 days. How long will it take 10 men to do this work?
- 50 days
- 60 days
- 70 days
- 80 days
Explanation
20 men can construct a building in 40 days.
Total work = 20 men × 40 days = 800 man-days.
Time = Total work / Number of men = 800 man-days / 10 men = 80 days.
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