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# If -2x > 3y, is x negative? (1) y > 0 (2) 2x + 5y - 20

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Manager
Joined: 04 Nov 2006
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If -2x > 3y, is x negative? (1) y > 0 (2) 2x + 5y - 20 [#permalink]

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10 Dec 2006, 15:58
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If -2x > 3y, is x negative?

(1) y > 0
(2) 2x + 5y - 20 = 0

I've looked at this several times and continue to get A as my answer, but this is apparently incorrect.
Director
Joined: 28 Dec 2005
Posts: 920
Followers: 2

Kudos [?]: 50 [0], given: 0

Re: DS from GMAT Prep [#permalink]

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10 Dec 2006, 16:12
artshep wrote:
If -2x > 3y, is x negative?

(1) y > 0
(2) 2x + 5y - 20 = 0

I've looked at this several times and continue to get A as my answer, but this is apparently incorrect.

1) if Y > 0 and -2X > 3Y, 3Y > 0 => -2X > 0 , X <0

2) 2X + 5Y = 20 => 2X +3Y + 2Y =20
=> 2X -2X + 2Y > 2X + 3Y +2Y
=> 2Y > 20
=> Y > 10 , X is negative

Ans: D
Manager
Joined: 04 Nov 2006
Posts: 158
Followers: 4

Kudos [?]: 12 [0], given: 0

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10 Dec 2006, 16:16
Ok, great explanation and approach. It simply never occurred to me to work it that way.

Thanks.
Director
Joined: 28 Dec 2005
Posts: 920
Followers: 2

Kudos [?]: 50 [0], given: 0

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10 Dec 2006, 18:43
thanks guys. just wish this were more consistent. sometimes, it "clicks" and sometimes it doesn't.
Senior Manager
Joined: 20 Feb 2006
Posts: 373
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10 Dec 2006, 19:14
I know that feeling - just hope it "clicks" on the day!
10 Dec 2006, 19:14
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