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Math question-need an answer

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Math question-need an answer [#permalink] New post 17 Jun 2011, 01:53
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

Could anybody please expalin this answer.the answer is 7.
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Re: Math question-need an answer [#permalink] New post 17 Jun 2011, 02:56
Given that 7 workers can build 7 cars in 7 days
so 1 worker can build 1 car in 7 days
1 worker can build 1/7 of a car per day
we have 5 workers
rate*time = work
(1/7)*5*t = 5 cars
t= 7 days
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Re: Math question-need an answer [#permalink] New post 17 Jun 2011, 06:39
repost:
work-rate-ps-93309.html

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Re: Math question-need an answer   [#permalink] 17 Jun 2011, 06:39
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