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In a used car lot, there are 3 times as many red cars as

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In a used car lot, there are 3 times as many red cars as [#permalink] New post 17 Dec 2012, 07:33
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In a used car lot, there are 3 times as many red cars as green cars. If tomorrow 12 green cars are sold and 3 red cars are added, then there will be 6 times as many red cars as green cars. How many green cars are currently in the lot?

Last edited by Bunuel on 17 Dec 2012, 07:39, edited 1 time in total.
Renamed the topic and moved to PS forum.
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Re: In a used car lot, there are 3 times as many red cars as [#permalink] New post 17 Dec 2012, 07:43
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Drik wrote:
In a used car lot, there are 3 times as many red cars as green cars. If tomorrow 12 green cars are sold and 3 red cars are added, then there will be 6 times as many red cars as green cars. How many green cars are currently in the lot?


Currently: R = 3G;

Tomorrow: R + 3 = 6*(G - 12) --> 3G + 3 = 6*(G - 12) --> G = 25.

Hope it's clear.
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Re: In a used car lot, there are 3 times as many red cars as   [#permalink] 17 Dec 2012, 07:43
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