Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 24 May 2017, 04:26

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# What is the value of x ?

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 38852
Followers: 7722

Kudos [?]: 105971 [0], given: 11602

What is the value of x ? [#permalink]

### Show Tags

07 Jan 2014, 05:19
Expert's post
4
This post was
BOOKMARKED
00:00

Difficulty:

5% (low)

Question Stats:

79% (01:32) correct 21% (00:50) wrong based on 315 sessions

### HideShow timer Statistics

The Official Guide For GMAT® Quantitative Review, 2ND Edition

What is the value of x ?

(1) -(x + y)= x- y
(2) x + y = 2

Data Sufficiency
Question: 23
Category: Algebra First- and second-degree equations
Page: 154
Difficulty: 500

GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!
[Reveal] Spoiler: OA

_________________
Math Expert
Joined: 02 Sep 2009
Posts: 38852
Followers: 7722

Kudos [?]: 105971 [0], given: 11602

Re: What is the value of x ? [#permalink]

### Show Tags

07 Jan 2014, 05:19
SOLUTION

What is the value of x ?

(1) -(x + y)= x- y --> $$-x-y=x-y$$ --> $$2x=0$$ --> $$x=0$$. Sufficient.

(2) x + y = 2. We cannot solve for x. Not sufficient.

_________________
Director
Joined: 25 Apr 2012
Posts: 727
Location: India
GPA: 3.21
Followers: 44

Kudos [?]: 745 [0], given: 723

Re: What is the value of x ? [#permalink]

### Show Tags

07 Jan 2014, 12:12
What is the value of x ?

(1) -(x + y)= x- y
(2) x + y = 2

St1: we have -x -y=x-y ---->-2x=0 and thus x=0 but y can have any value so not sufficient

St2:not sufficient as there are multiple options to satisfy the equation
So A,D and B are ruled out

Combining we get x= 0 and y=2

Ans C

Posted from my mobile device
_________________

“If you can't fly then run, if you can't run then walk, if you can't walk then crawl, but whatever you do you have to keep moving forward.”

Manager
Status: In pursuit of excellence...
Joined: 26 Oct 2013
Posts: 153
Location: India
Schools: ISB '16 (M)
GMAT 1: 610 Q46 V28
GMAT 2: 720 Q49 V40
WE: Project Management (Other)
Followers: 6

Kudos [?]: 55 [1] , given: 175

Re: What is the value of x ? [#permalink]

### Show Tags

07 Jan 2014, 13:11
1
KUDOS
Q. What is the value of x ?

(1) -(x + y)= x- y
(2) x + y = 2

Sol: This is a DS Qs where we have to find a definite value of x.

Now, we don't have any data in Qs stem. So, we can skip that.

Going, quickly to St. 1.. -(x+y)=x-y---> Expanding the brackets the equation becomes--> -x-y=x-y

Now cancelling -y from both ends (or in other words adding +y on both sides), we get -x=x to give us finally 2x=0--> giving us x=0

As , we have a definite value of x , now St.1-->Suff--> Ans may be AD

St.2 --> x+y=2.. now x and y can take diff. integral or fractional values (nothing mentioned in Qs stem ) . So, we can't figure out exact value of x.

Hence, St 2--> Insuff and ans IMO is A..

Hope this helps(if correct) .

Thanks
Dj.
Manager
Status: GMATting
Joined: 21 Mar 2011
Posts: 108
Concentration: Strategy, Technology
GMAT 1: 590 Q45 V27
Followers: 1

Kudos [?]: 96 [0], given: 104

Re: What is the value of x ? [#permalink]

### Show Tags

07 Jan 2014, 21:06
From Statement 1, -(x + y)= x- y
-x-y = x-y;
2x = 0;
=> x=0; (Sufficient)
From Statement 2, since the value of y could be anything, we can infer that it is insufficient.

Current Student
Joined: 03 Feb 2013
Posts: 939
Location: India
Concentration: Operations, Strategy
GMAT 1: 760 Q49 V44
GPA: 3.88
WE: Engineering (Computer Software)
Followers: 141

Kudos [?]: 950 [0], given: 547

Re: What is the value of x ? [#permalink]

### Show Tags

08 Jan 2014, 09:06
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

What is the value of x ?

(1) -(x + y)= x- y
(2) x + y = 2

statement 1) -x-y = x-y => 2x = 0 => x = 0 Sufficient
statement 2) x+y = 2 not sufficient as we don't know the value of y.

Hence A)
_________________

Thanks,
Kinjal

My Application Experience : http://gmatclub.com/forum/hardwork-never-gets-unrewarded-for-ever-189267-40.html#p1516961

Math Expert
Joined: 02 Sep 2009
Posts: 38852
Followers: 7722

Kudos [?]: 105971 [0], given: 11602

Re: What is the value of x ? [#permalink]

### Show Tags

11 Jan 2014, 07:20
SOLUTION

What is the value of x ?

(1) -(x + y)= x- y --> $$-x-y=x-y$$ --> $$2x=0$$ --> $$x=0$$. Sufficient.

(2) x + y = 2. We cannot solve for x. Not sufficient.

_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15415
Followers: 649

Kudos [?]: 206 [0], given: 0

Re: What is the value of x ? [#permalink]

### Show Tags

07 Sep 2016, 19:02
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: What is the value of x ?   [#permalink] 07 Sep 2016, 19:02
Similar topics Replies Last post
Similar
Topics:
12 What is the value of x? 40 08 Apr 2014, 09:09
3 What is the value of x + 7 ? 14 01 Jul 2014, 10:06
8 What is the value of x? 6 05 May 2016, 14:17
4 What is the value of x/yz? 10 16 Sep 2016, 15:54
7 What is the value of x? 9 19 Feb 2014, 00:14
Display posts from previous: Sort by