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Tricky x-y/x+y question

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Master | Next Rank: 500 Posts
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by gmatrant » Wed Nov 14, 2007 8:33 am
The answer should be C, how is it E.

Since x>0 and y<0
x-y/x+y
will become x+y/x-y.
so this is greater than 1.

Am I missing something..
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Source: — Data Sufficiency |
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by swle24 » Wed Nov 14, 2007 9:00 am
x-y/x+y>1? or x-y/x+y - x+y/x+y >0 or -2y/x+y>0?

1. x>0 insuf we dont know if x+y><0><0>0kai y<0><0 so insuf
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Junior | Next Rank: 30 Posts
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by swle24 » Wed Nov 14, 2007 9:02 am
2. insufficient, we dont know if x+y>0

taken together again we dont know if x+y>0 but only that x>0 and y<0
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by gmatrant » Wed Nov 14, 2007 9:21 am
swle24 wrote:x-y/x+y>1? or x-y/x+y - x+y/x+y >0 or -2y/x+y>0?

1. x>0 insuf we dont know if x+y><0><0>0kai y<0><0 so insuf
The post seems garbled.

If you dont mind can you present it step wise .. I am just not able to follow you..
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