17 men can build a building in 120 days. If the contractor wants to complete the work 35 days before then how many new workers he will recruit now?
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Explanation:
If 10 workers need 3 days to build 1 house then 1 worker needs 3 x 10 = 30 days to build 1 house.
So rate of work is 1 house / 30 worker days effort
So with 15 workers you get this 30 worker days effort in 30/15 = 2 days
So 15 workers would need 2 days to build a house
At this rate, to build 4 houses 15 workers need 4 x 2 = 8 days.
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