39 men repair a bridge in 12 days working 5 hours a day. In how many days will
30 persons working 6 hours a day, complete the work?
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Answer:
39 people = 5 hours = 12 days
30 people = 6 hours = ?
39 x 5 x 12 = 2340
2340 units of work
2340/6 = 390 days required for 1 person doing 6 hours a day
390/30 = 13.
It will take 30 people, who put in 6 hours a day, 13 days to complete the task.
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