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
Vote for Target Test Prep, Newsweek Readers’ Choice Awards 2026
NEWSWEEK READERS’ CHOICE 2026

BIG NEWS! Target Test Prep has been nominated, and they’d love your vote!

TTP has worked incredibly hard to build the best test prep experience possible, and winning Newsweek’s 2026 Readers’ Choice Award for Best Test Prep would mean a lot to them. If TTP has helped you, they’d be incredibly grateful for your vote. You can vote once each day through September 9.

Vote for TTP
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.

veritas ds # 43

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pmFollowed by: 88 members
Location: Milpitas, CA
Thanked: 447 times

by Rahul@gurome » Mon Aug 30, 2010 6:25 am
pradeepkaushal9518 wrote:is x^2 equal to xy?

1.x^2-y^2=(x+5)(y-5)

2.x=y
(1) x^2 - y^2 = xy + 5y - 5x - 25
x^2 + 5x + 25 = y^2 + 5y + xy
But this does not give any info on whether x^2 equal to xy.
So, (1) is NOT SUFFICIENT.

(2) x= y implies x^2 = xy
So, (2) is SUFFICIENT.

The correct answer is [spoiler](B)[/spoiler].
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 659
Joined: Mon Dec 14, 2009 8:12 amFollowed by: 3 members
Thanked: 32 times

by Gurpinder » Mon Aug 30, 2010 9:37 am
Hey Rahul,

Can you tell me what I am doing wrong?

The way I thought of it, statement 1 is sufficient.

(1) x^2-y^2=(x+5)(y-5)

Can't we use this to get the values for X and Y?

X= -5 and Y = 5

Therefore x^2=25 and (5)(-5)=-25

So Stmt 1 is sufficient?

Please advise,
"Do not confuse motion and progress. A rocking horse keeps moving but does not make any progress."
- Alfred A. Montapert, Philosopher.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 87
Joined: Wed Jun 16, 2010 7:57 pm
Location: Delhi,India
Thanked: 1 times

by puneetdua » Mon Aug 30, 2010 10:17 am
Hi,

In my first attemp i also thought answer is B but after reading Guprinder's comments - i lost the confidence in option B ...

i tried putting several values in option 1 to satisfy the relation but only -5 / 5 are satisgying - so D might be the answer ...

curious to know the OA..Pradeep can you please post the answer please..
Thanks
Puneet
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1261
Joined: Sun Sep 14, 2008 3:46 am
Thanked: 27 times
GMAT Score:570

by reply2spg » Mon Aug 30, 2010 11:54 am
Answer should be B. Here's how I got it,

A. x^2-y^2=(x+5)(y-5)

which means
x^2-y^2 = x^2 - 25

get rid of x^2 from both sides. you will get

y^2 = 25 and y = 5 or -5. You don't know x. so you can not say x^2=xy.
Gurpinder wrote:Hey Rahul,

Can you tell me what I am doing wrong?

The way I thought of it, statement 1 is sufficient.

(1) x^2-y^2=(x+5)(y-5)

Can't we use this to get the values for X and Y?

X= -5 and Y = 5

Therefore x^2=25 and (5)(-5)=-25

So Stmt 1 is sufficient?

Please advise,
Sudhanshu
(have lot of things to learn from all of you)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members
Location: Toronto
Thanked: 1710 times
GMAT Score:800

by Stuart@KaplanGMAT » Mon Aug 30, 2010 1:04 pm
Gurpinder wrote:Hey Rahul,

Can you tell me what I am doing wrong?

The way I thought of it, statement 1 is sufficient.

(1) x^2-y^2=(x+5)(y-5)

Can't we use this to get the values for X and Y?

X= -5 and Y = 5

Therefore x^2=25 and (5)(-5)=-25

So Stmt 1 is sufficient?

Please advise,
Hi,

x=5 and y=5 also makes the statement correct:

25 - 25 = (10)(0)

So, based on (1), the values could be:

x=-5 y=5; does (-5)^2 = (-5)(5)? NO

x=5 y=5; does (5)^2 = (5)(5)? YES
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1