Time problem

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karthikpandian19: Legendary Member; Posts: 1665; Joined: Thu Nov 03, 2011 7:04 pmFollowed by: 70 members; Thanked: 165 times

by karthikpandian19 » Mon Dec 05, 2011 9:35 pm

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) 351.

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Source: Beat The GMAT — Problem Solving | Mon Dec 05, 2011 9:35 pm

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Mon Dec 05, 2011 9:40 pm

karthikpandian19 wrote: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) 351.

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 5*7 = 35 days
5 workers can build 5 cars in 35/5 = 7 days

The correct answer is C.

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