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A job can be completed in 15 days by 12 men ( assuming they work at the same rate )

(a) how long will it take 5 men to finish the same job?

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If 12 men can complete a job in 15 days, then one man would take 12 times as long to complete the same job. That means one man would take 180 days to complete the job. If 5 men work together at the same rate, they would complete the job in 180/5 = 36 days.

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User Amindri
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