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do not understand OA for a GmatPrep1 - inequality

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Manager
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do not understand OA for a GmatPrep1 - inequality [#permalink]

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New post 16 Mar 2009, 19:09
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Hey all,
I do not quite understand the OA for the problem below.

I think for statement 1) we can assume that x and y are either:

positive-positive=0.5
pos.-neg.=0.5 (e.g. 0.2-(-0.3)=0.5)
neg-neg=0.5 (e.g. -0.3-(-0.8)=0.5)
not suffic.

statement 2) tells us x and y have the same signs, so it's not suffic.

Combining both of 1) and 2) should still give us 'not suffic.', because both statement 1) and 2) tell us x and y can be both positive or negative.

OA is C. What am I missing here? Do I need more coffee?? :P Could someone please help?
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Re: do not understand OA for a GmatPrep1 - inequality [#permalink]

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New post 16 Mar 2009, 19:43
stmt 1 tells us

2x -2y = 1 so x = y +1/2

from above we can says x > y.
x and y can be both positive or negative. Insufficient

stmt 2 tells us

(x/y) > 1 that means x and y can be both positive or negative. Insufficient.

combining both
y<0 x/y > 1 x<y
y>0 x/y > 1 x>y. clearly x and y are both positive,

Walkers graphical method is good.Please refer it.

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Re: do not understand OA for a GmatPrep1 - inequality [#permalink]

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New post 16 Mar 2009, 21:48
1. X,Y both can be positive
or x is +ve y is -ve

not sufficient
2)
x,y both must be +ve or -ve
not sufficient

combined

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

1/2y = x/y-1 = +ve (since x/y >1 )

so y +ve .. obvisouly x must be +Ve

C.
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Re: do not understand OA for a GmatPrep1 - inequality [#permalink]

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New post 17 Mar 2009, 07:25
Guys,
Can anyone explain why for statement 1) the following is not true:

2x-2y=1 => 2(x-y)=1 => x-y=0.5
pos.-neg.=0.5
e.g. 0.2-(-0.3)=0.5

Thanks a lot in advance!

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Re: do not understand OA for a GmatPrep1 - inequality   [#permalink] 17 Mar 2009, 07:25
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