What is the value of x + 7 ? (1) x + 3 = 14 (2) (x+2) 2 =

Oldest

Best Reply

Author

Message

TAGS:

Intern

Joined: 29 Mar 2010

Posts: 44

Location: Leeds

Schools: SBS, JBS(ding w/o interview), HEC

WE 1: SCI-12 yrs

Followers: 0

Kudos [?]: 5 [1] , given: 5

What is the value of x + 7 ? (1) x + 3 = 14 (2) (x+2) 2 = [#permalink]

13 May 2010, 10:36

This post received
KUDOS

00:00

Question Stats:

37% (00:00) correct

62% (00:09) wrong

based on 0 sessions

What is the value of │x + 7│?
(1) │x + 3│= 14
(2) (x+2)2 = 169

[Reveal] Spoiler:

OA: C

Intern

Joined: 29 Mar 2010

Posts: 44

Location: Leeds

Schools: SBS, JBS(ding w/o interview), HEC

WE 1: SCI-12 yrs

Followers: 0

Kudos [?]: 5 [0], given: 5

Re: Data Sufficiency Problem. [#permalink]

13 May 2010, 10:42

ajitsah wrote:

What is the value of │x + 7│?
(1) │x + 3│= 14
(2) (x+2)2 = 169

[Reveal] Spoiler:

OA: D

Am I missing something here. My ans was C.
Stat 1 gives two results; x= 11,-17
Stat 2 gives two results; x= 11,-15

Combining these two, we get that x=11 satisfies the statements and answers the question.
I have read this reasoning somewhere. Pls suggest whether the logic is correct or not, or what should be the strategy behind these type of questions when one variable satisfies both statements and in turn becomes sufficient to answer the question.
Thanks

GMAT Forum Moderator

Status: Accepting donations for the mohater MBA fund

Joined: 05 Feb 2008

Posts: 1821

Location: United States

Concentration: Healthcare, Economics

Schools: Ross '14 (A)

GMAT 1: 710 Q48 V38
GMAT 2: Q V

GPA: 3.54

WE: Accounting (Manufacturing)

Followers: 38

Kudos [?]: 317 [0], given: 232

Re: Data Sufficiency Problem. [#permalink]

13 May 2010, 10:44

ajitsah wrote:

What is the value of │x + 7│?
(1) │x + 3│= 14
(2) (x+2)2 = 169

One unknown, two equations.

Start with either one and you realize there are two possible values.

For (1): 11 and -17
For (2): 11 and -15

Thus each alone are not sufficient (knock off A, B and D).

Put the together and you see 11 is the only outcome in both that is the same.

The answer is C - together sufficient.

Yeah something is wrong with the OA (typo maybe)
_________________

Strategy Discussion Thread | Strategy Master | GMAT Debrief| Please discuss strategies in discussion thread. Master thread will be updated accordingly. | GC Member Write Ups

Find out what's new at GMAT Club - latest features and updates

Manager

Joined: 02 Aug 2009

Posts: 112

Followers: 2

Kudos [?]: 9 [0], given: 1

Re: Data Sufficiency Problem. [#permalink]

13 May 2010, 10:47

yeah I just had that exact same reaction...

Statement One X = 11 or -17 plugging it back into the equation X+7= 18 or,10 So NS

Statement Two X=11 or -15 plugging it back into the equation X+7 = 18 or 8

X=11 and X+7 is the only solution that is a constant and thus the answer C

There is no way this can be D unless you forgot to include a clause about X>0

Senior Manager

Joined: 19 Nov 2009

Posts: 337

Followers: 2

Kudos [?]: 47 [0], given: 44

Re: Data Sufficiency Problem. [#permalink]

13 May 2010, 11:29

Even I got C !

11 is the common value after solving the equations in Sts. 1 & 2..
_________________

"Success is going from failure to failure without a loss of enthusiam." - Winston Churchill

As vs Like - Check this link : http://www.grammar-quizzes.com/like-as.html.

Manager

Joined: 09 Apr 2010

Posts: 82

Followers: 1

Kudos [?]: 0 [0], given: 3

Re: Data Sufficiency Problem. [#permalink]

14 May 2010, 00:40

can you please quote the source ..the answer should not be D it should be C

1) x = 11 or x = -17
so |x + 7 | = 18 or x= 10

so 1 is not sufficient ...and if 1 is not sufficient how can the answer be D ??

Intern

Joined: 29 Mar 2010

Posts: 44

Location: Leeds

Schools: SBS, JBS(ding w/o interview), HEC

WE 1: SCI-12 yrs

Followers: 0

Kudos [?]: 5 [0], given: 5

Re: Data Sufficiency Problem. [#permalink]

14 May 2010, 03:32

neoreaves wrote:

It was from a question set, I got from my friend; don't know the source.
Sorry!!

Manager

Joined: 16 Feb 2010

Posts: 178

Followers: 2

Kudos [?]: 4 [0], given: 10

Re: Data Sufficiency Problem. [#permalink]

15 May 2010, 09:27

might be OA is not right.

CEO

Joined: 17 Nov 2007

Posts: 3594

Concentration: Entrepreneurship, Other

Schools: Chicago (Booth) - Class of 2011

GMAT 1: 750 Q50 V40

Followers: 231

Kudos [?]: 1300 [0], given: 346

Re: Data Sufficiency Problem. [#permalink]

08 Nov 2010, 06:59

I've changed OA in the first post. It's clearly C.
_________________

iOS/Android: GMAT ToolKit - The bestselling GMAT prep app | GMAT Club (free) | PrepGame | GRE ToolKit | LSAT ToolKit
PROMO: Are you an exiting GMAT ToolKit (iOS) user? Get GMAT ToolKit 2 (iOS) for free* (read more)
Math: GMAT Math Book ||| General: GMATTimer ||| Chicago Booth: Slide Presentation
The People Who Are Crazy Enough to Think They Can Change the World, Are the Ones Who Do.

Re: Data Sufficiency Problem. [#permalink] 08 Nov 2010, 06:59

	Similar topics	Author	Replies	Last post
Similar Topics:	What is the value of x^3 - 2x^2 + 7? (1) 3x^3- x = 2 (2)	Marina	6	18 Mar 2005, 18:33
	What is the value of x + 7 ? (1) x + 3 = 14 (2) (x + 2)^2 =	Nihit	6	02 Nov 2008, 12:11
	What is the value of \|x + 7\|? (1) \|x + 3\| = 14 (2) (x + 2)^2	twilight	5	04 Dec 2008, 14:33
	What is the value of x + 7 ? (1) x + 3 = 14 (2) (x + 2)^2 =	amitjash	13	18 Aug 2010, 01:49
	What is the value of x ? (1) x3 = 6x − x2 (2) 14x = x3 + 5	krishnasty	5	04 Oct 2011, 07:43

What is the value of x + 7 ? (1) x + 3 = 14 (2) (x+2) 2 =

Main navigation

GMAT Resources

Partners

MBA Resources

GMAT ® is a registered trademark of the Graduate Management Admission Council ® (GMAC ®). GMAT Club's website has not been reviewed or endorsed by GMAC.

GMAT Courses

Admissions Consulting

What is the value of x + 7 ? (1) x + 3 = 14 (2) (x+2) 2 =

What is the value of x + 7 ? (1) x + 3 = 14 (2) (x+2) 2 =

Main navigation

GMAT Resources

Partners

MBA Resources