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Updated on: 21 Sep 2019, 17:14
Originally posted by financeguy25 on 08 Mar 2009, 19:28.
Last edited by Bunuel on 21 Sep 2019, 17:14, edited 3 times in total.
Last edited by Bunuel on 21 Sep 2019, 17:14, edited 3 times in total.
EDITED.
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
82% (01:21) correct
18%
(01:37)
wrong
based on 1694
sessions
History
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Time
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What is the value of \(\frac{x}{yz}\)?
(1) \(x = \frac{y}{2}\) and \(z = \frac{2x}{5}\)
(2) \(\frac{x}{z} = \frac{5}{2}\) and \(\frac{1}{y} = \frac{1}{10}\)
DS86602.01
(1) \(x = \frac{y}{2}\) and \(z = \frac{2x}{5}\)
(2) \(\frac{x}{z} = \frac{5}{2}\) and \(\frac{1}{y} = \frac{1}{10}\)
DS86602.01
05 Jul 2013, 04:40
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What is the value of x/yz?
(1) \(x = \frac{y}{2}\) and \(z = \frac{2x}{5}\). If \(y=10\), then \(x=5\), \(z=2\) and in this case \(\frac{x}{yz}=\frac{5}{20}=\frac{1}{4}\) BUT if \(y=20\), then \(x=10\), \(z=4\) and in this case \(\frac{x}{yz}=\frac{10}{80}=\frac{1}{8}\). Not sufficient.
(2) \(\frac{x}{z} = \frac{5}{2}\) and \(\frac{1}{y} = \frac{1}{10}\). Multiply these two equations: \(\frac{x}{yz}=\frac{5}{20}\). Sufficient.
Answer: B.
(1) \(x = \frac{y}{2}\) and \(z = \frac{2x}{5}\). If \(y=10\), then \(x=5\), \(z=2\) and in this case \(\frac{x}{yz}=\frac{5}{20}=\frac{1}{4}\) BUT if \(y=20\), then \(x=10\), \(z=4\) and in this case \(\frac{x}{yz}=\frac{10}{80}=\frac{1}{8}\). Not sufficient.
(2) \(\frac{x}{z} = \frac{5}{2}\) and \(\frac{1}{y} = \frac{1}{10}\). Multiply these two equations: \(\frac{x}{yz}=\frac{5}{20}\). Sufficient.
Answer: B.
General Discussion
14 Feb 2014, 03:46
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St1: x = y/2 and z = 2x/5
This means, y = 2x.
yz = 2x * 2x/5 = 4x^2/5
x/yz = 5/4x. Not sufficient. We don't know the value of x.
St2: x/z = 5/2 and 1/y = 1/10
This means, z = 2x/5 and y = 10.
yz = 4x
x/yz = 1/4. Sufficient.
Answer (B).
This means, y = 2x.
yz = 2x * 2x/5 = 4x^2/5
x/yz = 5/4x. Not sufficient. We don't know the value of x.
St2: x/z = 5/2 and 1/y = 1/10
This means, z = 2x/5 and y = 10.
yz = 4x
x/yz = 1/4. Sufficient.
Answer (B).
