The bridge is completed in 20 days by 80 men. How long will it take 70 men to complete the work?
Answer: 23 days
Explanation
If 80 people complete the bridge in 20 days, then the total man-days required to complete the bridge is 80 people * 20 days = 1600 man-days.
Rounding up to the nearest whole number, 70 people will take approximately 23 days to complete the bridge
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