If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20 : GMAT Data Sufficiency (DS)
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# If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20

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If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20 [#permalink]

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17 Jul 2011, 22:36
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If x - y > 10, is x - y > x + y ?

(1) x = 8
(2) y = -20

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-x-y-10-is-x-y-x-y-105185.html
[Reveal] Spoiler: OA
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Re: If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20 [#permalink]

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17 Jul 2011, 23:06
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siddhans wrote:
if x-y > 10 , is x -y > x+ y?

1)x=8

2) y =- 20

Hello,

1. X = 8 ,
then 8 - Y > 10
-Y > 2
Y < -2

Substitute the values ==>
8-(-3) > 8 - 3 => 11 > 5 Sufficient(1)

2. Y = -20
then X - Y > 10
X + 20 > 10
X + 20 - 20 > 10 - 20
X > -20

Now, Substitute the values ==>
-21 + 20 > -21 -20
-1 > - 41 ==> Sufficient(2)

There, (D)

Regards,
Mustu
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Re: If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20 [#permalink]

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18 Jul 2011, 03:40
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siddhans wrote:
if x-y > 10 , is x -y > x+ y?

1)x=8

2) y =- 20

To prove: x-y>x+y
or x-y-x-y>0
or -2y>0
or y<0 ?

Stmt1: x=8
x-y > 10
8-y>10
-2-y>0
2+y<0
y<-2
Hence y < 0. Sufficient.

Stmt2: y=-20
Hence y <0. Sufficient.

OA D.
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Re: If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20 [#permalink]

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18 Jul 2011, 05:48
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Re: If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20 [#permalink]

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04 Aug 2014, 06:27
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Re: If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20 [#permalink]

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12 Aug 2014, 02:21
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If x - y > 10, is x - y > x + y ?

Given: $$x-y>10$$.
Question: is $$x-y>x+y$$? --> is $$2y<0$$? --> is $$y<0$$?

(1) $$x=8$$ --> $$8-y>10$$ --> $$y<-2$$, hence $$y<0$$. Sufficient.

(2) $$y=-20$$, hence $$y<0$$. Sufficient.

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-x-y-10-is-x-y-x-y-105185.html[/quote]
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Re: If x - y > 10, is x - y > x + y ? (1) x = 8 (2) y = -20   [#permalink] 12 Aug 2014, 02:21
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