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|x + y|...

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1 KUDOS received
GRE Instructor
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Joined: 10 Apr 2015
Posts: 1177
Followers: 44

Kudos [?]: 1053 [1] , given: 6

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|x + y|... [#permalink] New post 27 Jul 2016, 15:08
1
This post received
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Expert's post
00:00

Question Stats:

69% (00:19) correct 30% (00:19) wrong based on 39 sessions
Quantity A
Quantity B
|x + y|
|x| + |y|


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


Note: These questions are designed to help students master the quantitative comparison questions on our site: https://www.greenlighttestprep.com/modu ... comparison
[Reveal] Spoiler: OA

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Last edited by Carcass on 28 Jul 2016, 02:21, edited 1 time in total.
Editing the post and adding the tags
GRE Instructor
User avatar
Joined: 10 Apr 2015
Posts: 1177
Followers: 44

Kudos [?]: 1053 [0], given: 6

CAT Tests
Re: |x + y|... [#permalink] New post 28 Jul 2016, 10:05
Expert's post
GreenlightTestPrep wrote:
Quantity A
Quantity B
|x + y|
|x| + |y|



Let's use the strategy called LOOKING FOR EQUALITY.

Looking at the two quantities, I can see that they are EQUAL when x = 0 and y = 0
We get:
Quantity A: |x + y| = |0 + 0| = |0| = 0
Quantity B: |x| + |y| = |0| + |0| = 0 + 0 = 0
The two quantities are EQUAL

At this point, we know the correct answer is C or D

Now try some other values for x and y.
How about: x = -1 and y = 1
We get:
Quantity A: |x + y| = |-1 + 1| = |0| = 0
Quantity B: |x| + |y| = |-1| + |1| = 1 + 1 = 2
The two quantities are NOT EQUAL

Answer:
[Reveal] Spoiler:
D


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Re: |x + y|...   [#permalink] 28 Jul 2016, 10:05
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