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Math and Logic Puzzles
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Thirty men take 20 days to omplete a job working 9 hours a day.How many hour a day should 40 men work to complete the job?
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A
7 1/2 hrs
💡 Explanation:
Total work = 30 men × 20 days × 9 hours/day = 5400 man-hours. This work must be completed by 40 men in 20 days. Hours per day = 5400/(40×20) = 6.75 hours = 7.5 hours. Work done is inversely proportional to men when days are fixed.