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7 cars in 7 days

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7 cars in 7 days

by sanju09 » Tue Sep 14, 2010 3:50 am
If 7 workers can build 7 cars in 7 days, then how many days would it take 5 workers to build 5 cars?
(A) 1
(B) 5
(C) 7
(D) 25
(E) 35


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by Rahul@gurome » Tue Sep 14, 2010 4:06 am
7 workers can build 7 cars in 7 days.
1 worker can build 7 cars in 7*7 = 49 days
1 worker can build 1 car in 49/7 = 7 days
1 worker can build 5 cars in 7*5 = 35 days
5 workers can build 5 cars in 35/5 = 7 days

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