If x=1/2 and y=-1/2 then x+y>0
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Step-by-step explanation:
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GMAT Club Forum Index Data Sufficiency (DS)
If x>1 and y>1, is x<y? (1) x^2/(xy+x)<1 (2) xy/(y^2-y)<1 : Data Sufficiency (DS)
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Baten80
Updated on: Nov 11, 2017
00:00ABCDE
DIFFICULTY: 45% (medium) QUESTION STATS: based on 285 sessions
68% (01:59) correct
32% (02:18) wrong
If x>1 and y>1, is x<y?
(1) x^2/(xy+x)<1
(2) xy/(y^2-y)<1
Spoiler: ::
Spoiler: OA
Last edited by Bunuel on 11 Nov 2017, 08:17, edited 2 times in total.
Edited the OA.
Kudos
1 kudos, 6 bookmarks
Most Helpful Expert Reply
Bunuel
EXPERT'S
POST
Jan 27, 2012
Baten80 wrote:
If X>1 and Y>1, is X<Y?
(1) X^2/(XY+X)<1
(2) XY/Y^2-Y<1
I did B. But it is not OA.
OA is wrong. Answer is B.
If x>1 and y>1, is x<y?
(1) --> reduce by : --> cross multiply, notice that we can safely do that since : --> if and , then the answer is NO but if and , then the answer is YES. Not sufficient.
(2) --> reduce by : --> cross multiply, notice that we can safely do that since : --> ( is more than plus 1) --> . Sufficient.
Step-by-step explanation:
by putting the value of x and y in equation
1/2+(-1/2)
1/2-1/2
0
they are equal