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Thirty men take 20 days to complete a job working 9 hours a
day. How many hour a day should 40 men work to complete the job?
(a) 8 hrs
(b) 7 1/2 hrs
(c) 7 hrs
(d) 9 hrs
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Answer Posted / praveen
30 * 20 * 9 = 5400 man-hours required to complete the job
Let x = no. hrs a day to do the same job (assuming in 20 days)
40 * 20 * x = 5400
800x = 5400
x = 5400%2F800
x = 6.75 hrs a day for 20 days to do the same job
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