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What is the value of xy ?

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Status: 1,750 Q's attempted and counting
Affiliations: University of Florida
Joined: 09 Jul 2013
Posts: 496
Location: United States (FL)
Schools: UFL (A)
GMAT 1: 600 Q45 V29
GMAT 2: 590 Q35 V35
GMAT 3: 570 Q42 V28
GMAT 4: 610 Q44 V30
GPA: 3.45
WE: Accounting (Accounting)
What is the value of xy ?  [#permalink]

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New post 24 Oct 2013, 16:10
1
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

94% (00:33) correct 6% (00:49) wrong based on 134 sessions

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What is the value of xy ?

(1) x + y = 10
(2) x - y = 4

GH-10.23.12 | OE to follow
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Re: What is the value of xy ?  [#permalink]

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New post 24 Oct 2013, 23:20
Senior Manager
Senior Manager
User avatar
Status: 1,750 Q's attempted and counting
Affiliations: University of Florida
Joined: 09 Jul 2013
Posts: 496
Location: United States (FL)
Schools: UFL (A)
GMAT 1: 600 Q45 V29
GMAT 2: 590 Q35 V35
GMAT 3: 570 Q42 V28
GMAT 4: 610 Q44 V30
GPA: 3.45
WE: Accounting (Accounting)
Re: What is the value of xy ?  [#permalink]

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New post 29 Oct 2013, 20:54
Official Explanation

Answer: C
On their own, both of these statements are insufficient. To answer the question, we need the value of each of the two variables, but neither statement has enough information to find that.

Combined, they are sufficient. Add the two equations, and the result is 2x = 14, or x = 7. Plugging x = 7 into either equation, we find that y = 3 and thus, that xy = 21. Choice (C) is correct.
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Re: What is the value of xy ?  [#permalink]

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New post 10 Nov 2017, 06:45
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Re: What is the value of xy ? &nbs [#permalink] 10 Nov 2017, 06:45
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