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.

DS Question??

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 3
Joined: Sun Jan 06, 2008 7:58 pm
by rganesh » Wed Apr 09, 2008 1:56 pm
I'm stuck wondering why the answer is B and not D. Can someone explain why?
Is x2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y

I undersand the 2nd statement however, won't the answer to statement 1 be NO x2 does not equal xy and therefore it is sufficent because we are able to answer the Yes or No question?

I appreciate you assistance, maybe I am complicating things....
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 519
Joined: Sat Jan 27, 2007 7:56 am
Location: India
Thanked: 31 times

by Neo2000 » Wed Apr 09, 2008 9:55 pm
Umm how are you getting No from 1??

1 Equation , 2 unknowns => Cannot be solved. Nothing can be said from 1.

Atleast, i reasoned it that way. Am i missing something?
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

Re: DS Question??

by Stuart@KaplanGMAT » Thu Apr 10, 2008 10:59 am
rganesh wrote:I'm stuck wondering why the answer is B and not D. Can someone explain why?
Is x2 equal to xy?
(1) x2 – y2 = (x + 5)(y - 5)
(2) x = y

I undersand the 2nd statement however, won't the answer to statement 1 be NO x2 does not equal xy and therefore it is sufficent because we are able to answer the Yes or No question?

I appreciate you assistance, maybe I am complicating things....
We can rewrite statement (1) as:

(x+y)(x-y) = (x+5)(y-5)

We're allowed to pick x=5 and y=5 (since (10)(0) = (10)(0)).
Is 5^2 = 5*5? YES.

We're also allowed to pick x=-5 and y=5 (since (0)(-10) = (0)(0)).
Is (-5)^2 = 5*(-5)? NO.

We can get both a "yes" and a "no", so (1) is insufficient.
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
Newbie | Next Rank: 10 Posts
Posts: 3
Joined: Sun Jan 06, 2008 7:58 pm

Thanks!

by rganesh » Fri Apr 11, 2008 8:26 am
That's exactly the explanation I was looking for!
Much appreciated.
R
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 27
Joined: Thu Apr 10, 2008 1:20 pm
Thanked: 1 times

by humeixia » Fri Apr 11, 2008 3:53 pm
Yes, the answer is A.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1