SOLUTION: 12 men can build a 5 houses in 75 days.How long will 20 men take to build 7 such houses.

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Question 505286: 12 men can build a 5 houses in 75 days.How long will 20 men take to build 7 such houses.
Answer by htmentor(1343) About Me  (Show Source):
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12 men can build a 5 houses in 75 days.How long will 20 men take to build 7 such houses.
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(12 men x 75 days)/5 houses = 180 man-days per house
If 20 men build 7 houses, the number of days required is:
180 man-days/house * 7 houses/ 20 men = 63 days