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What is the value of when z = 3x, y = 4z, and xy ≠ 0 ? 12 1

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4756
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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What is the value of when z = 3x, y = 4z, and xy ≠ 0 ? 12 1 [#permalink] New post 17 Mar 2018, 07:20
Expert's post
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Question Stats:

71% (01:07) correct 28% (00:42) wrong based on 7 sessions
What is the value of \(\frac{xy}{z^2}\) when z = 3x, y = 4z, and xy ≠ 0 ?

A. 12
B. \(\frac{4}{3}\)
C. 1
D. \(\frac{3}{4}\)
E. \(\frac{1}{12}\)

Drill 1
Question: 2
Page: 497
[Reveal] Spoiler: OA

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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4756
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1668 [0], given: 396

CAT Tests
Re: What is the value of when z = 3x, y = 4z, and xy ≠ 0 ? 12 1 [#permalink] New post 18 Mar 2018, 06:45
Expert's post
Explanation

You know that \(\frac{xy}{z^2}\), so solve this one by plugging in values for z, x, and y. If x = 12, then z = 36 and y = 144; \(\frac{xy}{z^2}=\frac{12\times 144}{36^2}=\frac{4}{3}\). The correct answer is choice (B).
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Sandy
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Re: What is the value of when z = 3x, y = 4z, and xy ≠ 0 ? 12 1 [#permalink] New post 22 Mar 2018, 04:18
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Try to represent the quantity in one variable, such as y=4z then z=y/4. If z=y/4 then y/4=3x, so x=(y/4)/3. Now, we can represent all in a form of y variable. (y/12*y)/ (y/4)^2. Solving for y, we can get 4/3.
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Re: What is the value of when z = 3x, y = 4z, and xy ≠ 0 ? 12 1   [#permalink] 22 Mar 2018, 04:18
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