What is the value of x? : GMAT Data Sufficiency (DS)
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# What is the value of x?

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Manager
Joined: 04 Feb 2011
Posts: 63
Location: US
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Kudos [?]: 114 [0], given: 42

What is the value of x? [#permalink]

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05 Mar 2011, 05:00
00:00

Difficulty:

5% (low)

Question Stats:

82% (01:28) correct 18% (00:39) wrong based on 132 sessions

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What is the value of x?

(1) – (x + y) = x - y
(2) x + y = 2
[Reveal] Spoiler: OA
Math Forum Moderator
Joined: 20 Dec 2010
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Re: What is the value of x? [#permalink]

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05 Mar 2011, 05:11
1
KUDOS
1.
– (x + y) = x - y
-x-y=x-y
-x=x
-2x=0
x=0;
Sufficient.

2. x+y=2
x=2-y.
y unknown. x can't be found.
Not sufficient.

Ans: "A"
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Director
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Re: What is the value of x? [#permalink]

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06 Mar 2011, 12:23
1.

-x-y = x-y => x=0

One might think , huh two unknowns one equation , how are we gonna find value of x. On calculation ,we can see x =0.

Sufficient

2. y is needed to solve this one.
Not sufficient.

Intern
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Re: What is the value of x? [#permalink]

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12 May 2016, 02:15
Senior Manager
Status: Exam scheduled!!
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Concentration: Marketing, Technology
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Re: What is the value of x? [#permalink]

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16 Sep 2016, 15:48
A is the correct answer. Here's why:

(1) -(x+y) = x-y
= -x-y = x-y
= -x = x
= 2x = 0 --> x= 0

SUFFICIENT

(2) x+y = 2

NOT SUFFICIENT
Re: What is the value of x?   [#permalink] 16 Sep 2016, 15:48
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