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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] New post 15 Apr 2008, 09:56
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B
C
D
E

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IF x-y > 10 is x-y > x+y ?

1) x = 8

2) y = -20
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 15 Apr 2008, 12:02
IF x-y > 10 is x-y > x+y ?

1) x = 8

2) y = -20

from question we get :

X-Y>X+Y
so, X-X>Y+Y
2Y<0
Y<0

so st: 2 is sufficient.
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 15 Apr 2008, 12:39
shobuj wrote:
IF x-y > 10 is x-y > x+y ?

1) x = 8

2) y = -20

from question we get :

X-Y>X+Y
so, X-X>Y+Y
2Y<0
Y<0

so st: 2 is sufficient.


S1: insuff
y could be + or -

y=-20

S2: insuff.

X=1billion X=-9

I say C
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 15 Apr 2008, 12:50
I'd say B. Rephrase the statement:

x - y > x + y

x > x + 2y

0 > 2y

0 > y

So the question is asking...Is y negative?

Statement1) Not suff.
Statement2) Suff.

B. OA PLEASE?
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 15 Apr 2008, 12:59
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yup B
I think when it comes to such questions its better to solve the equation than to think of possible numbers which we can plug.
Just my 2 cents.
Also C seems too straightforward, dunno if GMAT gives gifts :lol:
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 15 Apr 2008, 13:03
I think D
St 1: x=8
x-y>10, so y <0, therefore x-y>x+y
St 1 suf

St 2: y=-20
x-y>10, so x>30, therefore x-y>x+y
St 2 suf
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 15 Apr 2008, 18:02
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Given: x-y > 10

(1) x=8

this means y < -2

which means x - y = 8 - ( <-2) > 10
also, x+ y =8 + (<-2) < 10

Therefore, stmt 1 is sufficient.

(2) I agree with the analysis for statement B being sufficient

Does anyone have the OA?
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 15 Apr 2008, 18:06
bhatiagp wrote:
IF x-y > 10 is x-y > x+y ?

1) x = 8

2) y = -20


D
Question similar to y<0?

1. x=8, and x-y>10 --> y<-2, so y<0. Suff
2. y=-20, defintely suff
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 15 Apr 2008, 18:53
agree with sodenso..

jimmyjamesdonkey, I would take your approach in bringing the 2nd part to "Is y<0?" but we can't toss out the first part... "x-y<10"... this is a must.

Therefore, as you stated... (2)... duh... y=-20

But, (1)... if x=8 and "x-y<10" is to be true (as is a must), then y<-2 and thus y<0

[D]
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Re: Gmatprep question :- DS (x-y) [#permalink] New post 16 Apr 2008, 21:39
Awesome trick question - The moment you see an obvious answer like C you know that GMAT is upto something. But the depth of its convoluted mind is really hard to comprehend ...
Re: Gmatprep question :- DS (x-y)   [#permalink] 16 Apr 2008, 21:39
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