GMAT Prep Problem...please explain

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ankit1383: Master | Next Rank: 500 Posts; Posts: 159; Joined: Sun Jul 27, 2008 8:41 pm; Thanked: 3 times

by ankit1383 » Sun Sep 28, 2008 10:23 pm

If x is not equal to -y , is (x-y)/(x+y) >1 ?

1 x> 0

2 y< 0

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Source: Beat The GMAT — Data Sufficiency | Sun Sep 28, 2008 10:23 pm

Gmatterz: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Mon Sep 22, 2008 1:47 am

by Gmatterz » Sun Sep 28, 2008 10:52 pm

if x not equal to -y that indicates

(x+y) not = 0

1.consider statement 1

x>0 which indicates x is positive and here we are not aware about the value of y henec it is insufficient

2.consider statement 2

y<0 which indicates y is always negative value but x value is uknown hence it is insufficient

Considering both the statements 1 and 2 together

x is positive and y is negative
if we substitute numbers in teh above equations

suppose x = 5 and y = -2

then (x-y)/(x+y) = 7/3 >1;

suppose x = 0.5 and y =-0.4

then (x-y)/(x+y) = 0.9/0.1 = 9 which is greater then 1

hence i assume that option C would be the best ans choice for this question

Whatz the OA?

Thanks

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rdxb: Senior | Next Rank: 100 Posts; Posts: 32; Joined: Tue Aug 05, 2008 4:09 am

by rdxb » Sun Sep 28, 2008 11:28 pm

if x not equal to -y that indicates

(x+y) not = 0

1.consider statement 1

x>0 which indicates x is positive and here we are not aware about the value of y henec it is insufficient

2.consider statement 2

y<0 which indicates y is always negative value but x value is uknown hence it is insufficient

Considering both the statements 1 and 2 together

x is positive and y is negative
if we substitute numbers in teh above equations

suppose x = 5 and y = -2

then (x-y)/(x+y) = 7/3 >1;

suppose x = 0.5 and y =-0.4

then (x-y)/(x+y) = 0.9/0.1 = 9 which is greater then 1

hence i assume that option C would be the best ans choice for this question

Whatz the OA?

Thanks

I think the answer should be E.
As the absolute value of x can be less than y, in which case (x-y)/(x+y) <1

for Example, lets take x =2, y=-3
so (x-y)/(x+y) = 5/-1 , which is less than 1
so, the data is not sufficient (E)

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sumithshah: Master | Next Rank: 500 Posts; Posts: 165; Joined: Wed May 28, 2008 11:25 pm; Thanked: 9 times; GMAT Score:730

by sumithshah » Tue Sep 30, 2008 8:50 am

OA is E

https://www.urch.com/forums/gmat-data-su ... y-1-a.html

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