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DS: inequality

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Source: — Data Sufficiency |
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by gmatclubmember » Tue Sep 20, 2011 9:24 am
[email protected] wrote:Q: IS X >2

1: X/Y > 2/Y
2: XY > 0
1. (x-2)/y > 0. we cannot conclude anything about (x-2) until we know the sign of y. Insufficient
2. xy>0 means that either both are positive or both are negative. But doesnt tell us anything more. Insufficient

Combined 1 and 2:
Both the statements together still doesnt give us the sign of y (or x).

So both the statements together not sufficient.

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by bijoyajj » Tue Sep 20, 2011 9:31 am
yeah.. answer is e..
Last edited by bijoyajj on Tue Sep 20, 2011 10:15 am, edited 1 time in total.
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by saketk » Tue Sep 20, 2011 9:48 am
[email protected] wrote:Q: IS X >2

1: X/Y > 2/Y
2: XY > 0
Start with easy statement first..

Statement 2: clearly does not tells us anything about the value of x. INSUFFICIENT

Statement 1: take values
let x = -1
y = -1

this satisfies the condition

1> (-2)

now take x=4
y =2
this also satisfies the condition
2>1

hence , this statement also is NOT SUFFICIENT

Use both the statements together
statement 2 tells us that either x & y are both >0 or both <0

if you read the numbers I used in Statement A -- those numbers can be used in this case as well.

Clearly both statements taken together are also NOT SUFFICIENT

IMO - E
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