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

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Senior Manager
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Joined: 09 May 2012
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What is the value of x – y ? [#permalink]

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27 May 2012, 08:11
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5% (low)

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90% (01:37) correct 10% (00:37) wrong based on 105 sessions

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What is the value of x – y ?

(1) w + z = 7
(2) wx – wy + xz – yz = 12
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Re: What is the value of x – y ? [#permalink]

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28 May 2012, 01:46
What is the value of x – y ?

(1) w + z = 7. Clearly insufficient.
(2) wx – wy + xz – yz = 12 --> $$w(x-y)+z(x-y)=12$$ --> $$(w+z)(x-y)=12$$. Not sufficient.

(1)+(2) Since from (1) $$w+z=7$$ then from (2) $$7*(x-y)=12$$ --> $$x-y=\frac{12}{7}$$. Sufficient.

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Re: What is the value of x – y ?   [#permalink] 28 May 2012, 01:46
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# What is the value of x – y ?

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