Question : 40 men can construct a building in 100 days. How long will it take 80 men to do this work?
Option 1: 60 days
Option 2: 80 days
Option 3: 50 days
Option 4: 40 days
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Correct Answer: 50 days
Solution : Given: 40 men can construct a building in 100 days. So, 80 men can construct a building in $\frac{100}{80}\times 40=50$ days. Hence, the correct answer is 50 days.
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