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Updated on: 12 Jan 2014, 06:02
Originally posted by udaymathapati on 26 Sep 2010, 11:34.
Last edited by Bunuel on 12 Jan 2014, 06:02, edited 1 time in total.
Last edited by Bunuel on 12 Jan 2014, 06:02, edited 1 time in total.
Edited the OA.
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
94% (00:46) correct
6%
(01:50)
wrong
based on 366
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History
Date
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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
I arrivied at answer D, but OA is diff. Please explain where is the trap?
A. 11
B. 15
C. 24
D. 27
E. 32
I arrivied at answer D, but OA is diff. Please explain where is the trap?
26 Sep 2010, 11:36
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udaymathapati
\(\frac{red}{black}=\frac{3x}{8x}\) --> \(black=8x=72\) --> \(x=9\) --> \(red=3x=27\).
Answer: D (C is not correct).
Moreover if \(red=24\) then \(\frac{red}{black}=\frac{24}{72}=\frac{3}{9}\) and not \(\frac{3}{8}\).
Hope it helps.
26 Sep 2010, 20:04
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D is correct
R/B = 3/8 and B =72
R = 72*3/8 = 27
R/B = 3/8 and B =72
R = 72*3/8 = 27
