Equation

Expert replies

Previous Topic Next Topic

apshara5: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Sun Nov 14, 2010 8:08 am

by apshara5 » Wed Oct 26, 2011 11:38 pm

What is the value of x?

(1) x + 2y = 4

(2) 5x + y + 15 = 3x - 3y + 23

Ans: E

Like this post

Source: Beat The GMAT — Data Sufficiency | Wed Oct 26, 2011 11:38 pm

GmatKiss: Legendary Member; Posts: 2789; Joined: Tue Jul 26, 2011 12:19 amFollowed by: 43 members; Location: Chennai, India; Thanked: 206 times; GMAT Score:640

by GmatKiss » Thu Oct 27, 2011 1:21 am

IMO: E, what's the doubt?

Like this post

GMAT/MBA Expert

Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Thu Oct 27, 2011 3:29 am

apshara5 wrote:What is the value of x?

(1) x + 2y = 4
(2) 5x + y + 15 = 3x - 3y + 23

Statement 1: One equation in two unknown is not enough to determine the value of x.

NOT sufficient

Statement 1: 5x + y + 15 = 3x - 3y + 23
---> (5x - 3x) + (y + 3y) + (15 - 23) = 0
---> 2x + 4y - 8 = 0
---> x + 2y - 4 = 0
---> x + 2y = 4 ------ Same as the equation in statement 1
One equation in two unknown is not enough to determine the value of x.

NOT sufficient

1 & 2 Together: No new information ---> NOT sufficient

The correct answer is E.

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/

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review