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Updated on: 06 Mar 2023, 00:27
Originally posted by GMATBusters on 09 Nov 2018, 09:43.
Last edited by Bunuel on 06 Mar 2023, 00:27, edited 2 times in total.
Last edited by Bunuel on 06 Mar 2023, 00:27, edited 2 times in total.
Renamed the topic and edited the question.
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
72% (01:12) correct
28%
(01:23)
wrong
based on 925
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What is the value of \(x - y\)?
(1) \(x - y = y - x\)
(2) \(x - y = x^2 - y^2\)
(1) \(x - y = y - x\)
(2) \(x - y = x^2 - y^2\)
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09 Nov 2018, 10:03
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gmatbusters
statement 1:
x - y = y- x
2x = 2y
x = y.
Sufficient.
Statement 2:
\(x - y = x^2 - y^2\). we don't know the value of x and y .Not sufficient.
The best answer is A.
General Discussion
09 Nov 2018, 21:13
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gmatbusters
Question: \(x - y = ?\)
Statement 1: \(x - y = y - x\)
i.e. x - y - y + x = 0
i.e. 2(x-y) = 0
i.e. x-y = 0
SUFFICIENT
Statement 2: \(x - y = x^2 - y^2\)
i.e. \(x - y = (x+y)*(x - y)\)
i.e. \((x+y)*(x - y) - (x-y) = 0\)
i.e. \((x-y)*[(x+y)-1] = 0\)
i.e. \((x-y)= 0\) OR \((x+y)-1 = 0\)
i.e. either \((x-y)= 0\) OR\((x+y) = 1\)
so we are not sure about the value of (x-y) hence
NOT SUFFICIENT
Answer: Option A
