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Are x and y both positive? 1. 2x-2y = 1 2. x/y >1

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Are x and y both positive? 1. 2x-2y = 1 2. x/y >1 [#permalink] New post 30 Jul 2006, 20:03
00:00
A
B
C
D
E

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(N/A)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 1 sessions
Are x and y both positive?

1. 2x-2y = 1
2. x/y >1
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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Re: DS: X and Y +ve [#permalink] New post 30 Jul 2006, 20:13
ps_dahiya wrote:
Are x and y both positive?

1. 2x-2y = 1
2. x/y >1


C.

fromi, x and y can be anything.

from ii x and y both are either +ves or -ves. if they both are +ves, x>y. if they both are -ves, y>x.

from i and ii, x and y both are +ves. they are not -ves. if they are -ves and y>x, 2x-2y cannot be 1. so they both are +ves.

guys, after long time i am back. spare me.
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 [#permalink] New post 30 Jul 2006, 20:55
CHEN wrote:
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C 100%

More important to others is why?
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Re: DS: X and Y +ve [#permalink] New post 30 Jul 2006, 21:01
Combine S1 and S2.
if y>0
x>y>0
x-y = 1/2 tells that both are positive.

if y<0
x<y<0
x<y=> x-y<0 != 1/2
sufficient.

Thus, C
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 [#permalink] New post 31 Jul 2006, 03:09
C

1) 2x-2y =1
x-y = 1/2

Hence x>y , but y can be -ve. hence not Suff

2) x/y > 1
Hence either x and y both are positive or both are negative. Not suff

Together

Suff.
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Re: DS: X and Y +ve [#permalink] New post 31 Jul 2006, 06:25
Professor wrote:
ps_dahiya wrote:
Are x and y both positive?

1. 2x-2y = 1
2. x/y >1


C.

fromi, x and y can be anything.

from ii x and y both are either +ves or -ves. if they both are +ves, x>y. if they both are -ves, y>x.

from i and ii, x and y both are +ves. they are not -ves. if they are -ves and y>x, 2x-2y cannot be 1. so they both are +ves.

guys, after long time i am back. spare me.

Thanks.

Where the hell you were hiding??? :peek :peek
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 [#permalink] New post 31 Jul 2006, 15:08
The answer according to me is E

St1 and St2 are satsified if X=1,Y=1/2 i.e. X/Y>1 and X-Y=1/2

But if you choose X=-1/2,Y=-1 you still get X/Y>1 and X-Y=1/2

Am I doing something wrong here ?
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Re: DS: X and Y +ve [#permalink] New post 31 Jul 2006, 17:09
ps_dahiya wrote:
Professor wrote:
ps_dahiya wrote:
Are x and y both positive?

1. 2x-2y = 1
2. x/y >1


C.

fromi, x and y can be anything.

from ii x and y both are either +ves or -ves. if they both are +ves, x>y. if they both are -ves, y>x.

from i and ii, x and y both are +ves. they are not -ves. if they are -ves and y>x, 2x-2y cannot be 1. so they both are +ves.

guys, after long time i am back. spare me.

Thanks.

Where the hell you were hiding??? :peek :peek


didn't you see me? i was just behind you! :wink:
Senior Manager
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 [#permalink] New post 31 Jul 2006, 17:10
Oops .. I am wrong... X/Y < 1 for my second scenario... C it is.
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 [#permalink] New post 31 Jul 2006, 17:12
gmatornot wrote:
The answer according to me is E

But if you choose X=-1/2,Y=-1 you still get X/Y>1 and X-Y=1/2
Am I doing something wrong here ?


X=-1/2,Y=-1 X/Y=1/2 < 1...
But S2 says X/Y > 1..
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  [#permalink] 31 Jul 2006, 17:12
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