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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Does x = y?

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 2898
Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members
Thanked: 6 times
by Vincen » Tue Jan 16, 2018 9:07 am
Does x = y?

(1) 4x - 2y = 80
(2) x = (40 + y)/2

The OA is the option E.

Using both equations, cannot find the correct answer? Experts, I would be thankful for your explanation.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 2663
Joined: Wed Jan 14, 2015 8:25 amFollowed by: 128 members
Location: Boston, MA
Thanked: 1153 times
GMAT Score:770

by DavidG@VeritasPrep » Tue Jan 16, 2018 12:07 pm
Vincen wrote:Does x = y?

(1) 4x - 2y = 80
(2) x = (40 + y)/2

The OA is the option E.

Using both equations, cannot find the correct answer? Experts, I would be thankful for your explanation.
The key is to recognize that the statements are identical:
Statement 2: x = (40 + y)/2
Multiply both sides by 4:
4x = 2(40 + y)
4x = 80 + 2y
4x - 2y = 80
Clearly, neither statement alone is sufficient, so if the statements are identical, the answer must be E

(If it doesn't feel intuitive that neither statement alone is sufficient, consider cases, If x = y, then we'd have 4x -2x =80 --> 2x = 80 --> x =. 40. So it could be the case that x = 40 and y = 40, giving us a YES. But it could also be the case that x = 20 and y = 0, giving us a NO.)
Veritas Prep | GMAT Instructor

Veritas Prep Reviews
Save $100 off any live Veritas Prep GMAT Course
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 8190
Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members
Location: Los Angeles, CA
Thanked: 43 times

by Scott@TargetTestPrep » Thu Jan 18, 2018 1:42 pm
Vincen wrote:Does x = y?

(1) 4x - 2y = 80
(2) x = (40 + y)/2
We need to determine whether x = y.

Statement One Alone:

4x - 2y = 80

Simplifying the equation we have, 2x - y = 40; however, we cannot determine whether x = y. If we let x = 0 and y = -40, then we see that x is not equal to y. However, if we let x = 40/3 and y = 40/3, then x = y.

Statement Two Alone:

x = (40 + y)/2

Simplifying the equation, we have:

2x = 40 + y

2x - y = 40

Again, we cannot determine whether x = y.

Statements One and Two Together:

Using both statements together, we see that they produce the identical equations of 2x - y = 40; thus, we cannot determine whether x = y.

Answer: E

Scott Woodbury-Stewart
Founder and CEO
[email protected]

Image

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

ImageImage
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1