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Source: — Data Sufficiency |
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by theCEO » Sun Aug 12, 2012 4:58 pm
aislam3 wrote:is x>y?
1. 10+x=20+y,
2. x^2>y^2
eq1. Sufficient:
eq is rewritten as: x - y = 10
x has to be greater than y in order to get a positive value of 10


eq2. Insufficient
x and y could take up any value for eg x=2, y=1 or x=-2, y=1
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by Anurag@Gurome » Sun Aug 12, 2012 6:52 pm
aislam3 wrote:is x>y?
1. 10+x=20+y,
2. x^2>y^2
(1) 10 + x = 20 + y or x - y = 10, which clearly implies that x > y; SUFFICIENT.

(2) x² > y²
If x = -4, y = -3, then x² = 16 and y² = 9, but here x < y.
If x = 4, y = 3, then x² = 16 and y² = 9; here x > y.
No definite answer; NOT sufficient.

The correct answer is A.
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