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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