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18 Jul 2009, 21:09
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Dear People,
Just ran into some fresh difficulties during my revision on DS...
The question is as below:
Is x^2 equal to xy?
(1) x^2 – y^2 = (x + 5)(y - 5)
(2) x = y
I feel that Statement 1 is quite deceiving, since only one part of it answers the question, while the other part seems irrelevant.
Please provide some explanations & workings if possible. THank you very much.
Just ran into some fresh difficulties during my revision on DS...
The question is as below:
Is x^2 equal to xy?
(1) x^2 – y^2 = (x + 5)(y - 5)
(2) x = y
I feel that Statement 1 is quite deceiving, since only one part of it answers the question, while the other part seems irrelevant.
Please provide some explanations & workings if possible. THank you very much.
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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
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[quote="cialit0506"]Dear People,
Just ran into some fresh difficulties during my revision on DS...
The question is as below:
Is x^2 equal to xy?
(1) x^2 – y^2 = (x + 5)(y - 5)
(2) x = y
x^2 can = xy only if /x/=/y/ or x = 0
(x-y)(x+y) = (x+5)(y-5)
if we assume that (x-y) = (x+5) thus y = -5 and if we assumed that(x+y) = (y-5) = then x=-5 either ways /y/=/x/
x = +or-ve 5 and so is y ie // is the same .............suff
from b.....obvious suff
answer is D
Just ran into some fresh difficulties during my revision on DS...
The question is as below:
Is x^2 equal to xy?
(1) x^2 – y^2 = (x + 5)(y - 5)
(2) x = y
x^2 can = xy only if /x/=/y/ or x = 0
(x-y)(x+y) = (x+5)(y-5)
if we assume that (x-y) = (x+5) thus y = -5 and if we assumed that(x+y) = (y-5) = then x=-5 either ways /y/=/x/
x = +or-ve 5 and so is y ie // is the same .............suff
from b.....obvious suff
answer is D
19 Jul 2009, 12:19
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I am unable to see how stmt 1 is sufficient. Can someone please explain?
