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Math Revolution GMAT Instructor
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x-y=?  [#permalink]

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New post 09 Feb 2016, 18:20
00:00
A
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E

Difficulty:

  5% (low)

Question Stats:

88% (00:29) correct 12% (00:35) wrong based on 129 sessions

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x-y=?

1) (x-y)^5=32
2) |x-y|=2


* A solution will be posted in two days.

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
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Re: x-y=?  [#permalink]

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New post 09 Feb 2016, 20:54
MathRevolution wrote:
x-y=?

1) (x-y)^5=32
2) |x-y|=2


* A solution will be posted in two days.



Hi,
we are to find the value of x-y..
the statements are
1) (x-y)^5=32
since it hs odd power x-y can have only one value,2..
suff

2) |x-y|=2
since it gives us value of mod, the value can be 2 or -2..
Insuff

A
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3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Math Revolution GMAT Instructor
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Re: x-y=?  [#permalink]

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New post 11 Feb 2016, 23:00
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.

x-y=?

1) (x-y)^5=32
2) |x-y|=2

In the original condition and the question,
x-y=?
For 1), x-y=2
For 2), x-y=-2,2
Thus, 1) is unique and sufficient. The answer is A.


 Once we modify the original condition and the question according to the variable approach method 1, we can solve approximately 30% of DS questions.
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Re: x-y=?  [#permalink]

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New post 06 Mar 2018, 05:39
MathRevolution wrote:
x-y=?

1) (x-y)^5=32
2) |x-y|=2


* A solution will be posted in two days.


Question: x-y=?

St 1: (x-y)^5=32 (Please note that odd exponent retains the original sign of the base)

(x-y)^5=2^5

x-y = 2 Sufficient

|x-y|=2

means |x-y|= 2 or -2 Not Sufficient

(A)
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Re: x-y=? &nbs [#permalink] 06 Mar 2018, 05:39
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