GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 17 Jun 2019, 08:04

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# x-y=?

Author Message
TAGS:

### Hide Tags

Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 7462
GMAT 1: 760 Q51 V42
GPA: 3.82

### Show Tags

09 Feb 2016, 18:20
00:00

Difficulty:

5% (low)

Question Stats:

90% (00:39) correct 10% (01:22) wrong based on 153 sessions

### HideShow timer Statistics

x-y=?

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

* A solution will be posted in two days.

_________________
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.
"Only \$149 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"
Math Expert
Joined: 02 Aug 2009
Posts: 7749

### Show Tags

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
_________________
Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 7462
GMAT 1: 760 Q51 V42
GPA: 3.82

### Show Tags

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.
_________________
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.
"Only \$149 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"
SVP
Status: It's near - I can see.
Joined: 13 Apr 2013
Posts: 1692
Location: India
GPA: 3.01
WE: Engineering (Real Estate)

### Show Tags

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)
_________________
"Do not watch clock; Do what it does. KEEP GOING."
Re: x-y=?   [#permalink] 06 Mar 2018, 05:39
Display posts from previous: Sort by