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
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Joined: 04 Feb 2011
Posts: 63
Location: US
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Kudos [?]: 102 [0], given: 42

What is the value of x? [#permalink]

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New post 05 Mar 2011, 05:00
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

83% (01:26) correct 17% (00:35) wrong based on 128 sessions

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What is the value of x?

(1) – (x + y) = x - y
(2) x + y = 2
[Reveal] Spoiler: OA
1 KUDOS received
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Kudos [?]: 1669 [1] , given: 376

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

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New post 05 Mar 2011, 05:11
1
This post received
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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Re: What is the value of x? [#permalink]

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New post 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.


Hence the answer is A.
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Re: What is the value of x? [#permalink]

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New post 12 May 2016, 02:15
please add the oa its a.
Senior Manager
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Re: What is the value of x? [#permalink]

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New post 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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