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Math question-need an answer

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Intern
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Joined: 17 Jun 2011
Posts: 4

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Math question-need an answer [#permalink]

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New post 17 Jun 2011, 02:53
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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Manager
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Joined: 19 Apr 2011
Posts: 106

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Re: Math question-need an answer [#permalink]

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New post 17 Jun 2011, 03:56
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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Location: United States
Concentration: Operations, Finance
Schools: Ross '14 (M)
GMAT 2: 710 Q48 V38
GPA: 3.54
WE: Accounting (Manufacturing)
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Re: Math question-need an answer [#permalink]

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New post 17 Jun 2011, 07:39
repost:
work-rate-ps-93309.html

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Kudos [?]: 914 [0], given: 234

Re: Math question-need an answer   [#permalink] 17 Jun 2011, 07:39
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