BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

If a, b, and c are integers, is a - b + c greater than a+ b

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pm
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by Anurag@Gurome » Sun Mar 18, 2012 5:02 am
pappueshwar wrote:If a, b, and c are integers, is a - b + c greater than a+ b - c?

1) b is negative
2) c is positive

OA IS C

How to approach these kind of problems? there are so many combinations of numbers that are to be taken for A, B,C
Is (a - b + c) > (a + b - c)?
Or is 2c > 2b
Or is c > b?

(1) b is negative or b < 0 does not imply if c > b or not; NOT sufficient.

(2) c is positive or c > 0 again does not imply if c > b or not; NOT sufficient.

Combining (1) and (2), b < 0 and c > 0 implies c > b; SUFFICIENT.

The correct answer is C.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Master | Next Rank: 500 Posts
Posts: 234
Joined: Fri Oct 01, 2010 7:28 pm
Location: chennai
Thanked: 5 times
Followed by:4 members

by pappueshwar » Sun Mar 18, 2012 5:36 am
Anurag,

how is the below eq solved? i mean how did u get 2c> 2b

Is (a - b + c) > (a + b - c)?
Or is 2c > 2b
Or is c > b?
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pm
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by Anurag@Gurome » Sun Mar 18, 2012 7:30 pm
pappueshwar wrote:Anurag,

how is the below eq solved? i mean how did u get 2c> 2b

Is (a - b + c) > (a + b - c)?
Or is 2c > 2b
Or is c > b?
(a - b + c) > (a + b - c)
Subtract a from both sides, we get
(-b + c) > (b - c)
Adding b on both sides,
c > 2b - c
Adding c on both sides,
2c > 2b

Hope that helps.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
User avatar
Senior | Next Rank: 100 Posts
Posts: 30
Joined: Fri Jan 30, 2009 12:51 am
Location: Pune

by ameya85 » Mon Mar 19, 2012 12:17 am
Thanks for the explaination Anurag. It took me 2:32 min to solve this question with all possible combination. I have mostly overlooked importance of re-phrasing the DS question while studying Manhattan Guides but now I see how important re-phrasing is. With the re-phrasing, question could have been solved in less than a minute. :)

Ameya
Top
Post new topic Post Reply
• Page 1 of 1