The bridge is completed in 45 days by 105 men. How it will take 90 men to do the work?
Answer: 52 1/2
Explanation
105 men complete the work in 45 days
Total work = 105 men * 45 days = 4725 man-days
Now, 90 men will complete the work:
4725 man-days / 90 men = 52.5 days
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