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CEO
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Are x and y both positive? 1. 2x-2y = 1 2. x/y >1 [#permalink]
 30 Jul 2006, 21:03
Question Stats:
100% (00:00) correct
0% (00:00) wrong based on 0 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]
30 Jul 2006, 21:13
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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CEO
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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]
30 Jul 2006, 22:01
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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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]
31 Jul 2006, 07:25
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??? 
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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]
31 Jul 2006, 18:09
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??? didn't you see me? i was just behind you! 
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Oops .. I am wrong... X/Y < 1 for my second scenario... C it is.
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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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