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The ratio of the number of red cars in a certain parking lot

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The ratio of the number of red cars in a certain parking lot [#permalink] New post 05 Aug 2006, 08:22
The ratio of the number of red cars in a certain parking lot to the number of black cars is 3 to 8. If there are 72 black cars in the lot, how many red cars are there in the lot?

A. 11
B. 15
C. 24
D. 27
E. 32
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 [#permalink] New post 05 Aug 2006, 10:15
D

3/8 = x/72

=> x = (72 * 3)/8 = 27
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 [#permalink] New post 05 Aug 2006, 11:40
D. Not much more to say about this.
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Re: The ratio of the number [#permalink] New post 05 Aug 2006, 21:05
ong wrote:
The ratio of the number of red cars in a certain parking lot to the number of black cars is 3 to 8. If there are 72 black cars in the lot, how many red cars are there in the lot?

A. 11
B. 15
C. 24
D. 27
E. 32


R/B = 3/8
R = 3B/7
R= 3*72/8
R= 27

D
Heman
Re: The ratio of the number   [#permalink] 05 Aug 2006, 21:05
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