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Joined: 02 Sep 2009
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Is x > y? (1) x  5 > y  5 (2) x^2> xy [#permalink]
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23 Nov 2017, 08:46
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71% (00:50) correct 29% (00:36) wrong based on 21 sessions
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Re: Is x > y? (1) x  5 > y  5 (2) x^2> xy [#permalink]
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23 Nov 2017, 09:08
(1) x5 > y5 .. we can cancel 5 from both sides. This gives us x > y. Sufficient.
(2) x^2 > xy or x^2  xy > 0 or x*(xy) > 0 This means either both x>0 and xy>0 OR both x<0 and xy<0 So either x>0 & x>y OR x<0 and x<y. So we cannot be sure whether x>y or x<y. Not sufficient.
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Re: Is x > y? (1) x  5 > y  5 (2) x^2> xy
[#permalink]
23 Nov 2017, 09:08






