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

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Manager
Joined: 08 Oct 2005
Posts: 101
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The ratio of the number of red cars in a certain parking lot [#permalink]  05 Aug 2006, 07:22
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
Senior Manager
Joined: 14 Jul 2005
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D

3/8 = x/72

=> x = (72 * 3)/8 = 27
SVP
Joined: 31 Jul 2006
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Manager
Joined: 20 Mar 2006
Posts: 200
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Re: The ratio of the number [#permalink]  05 Aug 2006, 20:05
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, 20:05
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