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

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

DS question

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 44
Joined: Fri Mar 30, 2007 3:11 pm
by gviren » Fri May 18, 2007 4:15 am
the question is
If X and Y are integers, does x = y?
1) xy = y2 (2 here is square)
2) x2 = y2 (2 here is square)

I think the answer should be B but OA is D.

(1) is insufficient as y can be 0 and the eqn will not satisfy
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Legendary Member
Posts: 559
Joined: Tue Mar 27, 2007 1:29 amFollowed by: 2 members
Thanked: 5 times

by Cybermusings » Fri May 18, 2007 4:53 am
If X and Y are integers, does x = y?
1) xy = y2 (2 here is square)
2) x2 = y2 (2 here is square)

xy = y^2
x=y
Statement A is sufficient

x^2 = y^2
If x = (-5)^2 and y =5^2
Then x and y are not equal
If x = 5 and y = 5
Then x=y

Statement B is insufficient
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Community Manager
Posts: 789
Joined: Sun Jan 28, 2007 3:51 pmFollowed by: 1 member
Location: Silicon valley, California
Thanked: 30 times

Re: DS question

by jayhawk2001 » Fri May 18, 2007 8:05 am
gviren wrote:the question is
If X and Y are integers, does x = y?
1) xy = y2 (2 here is square)
2) x2 = y2 (2 here is square)

I think the answer should be B but OA is D.

(1) is insufficient as y can be 0 and the eqn will not satisfy
I'm not too convinced (1) is sufficient.

1 - insufficient
xy = y^2
y(x-y) = 0
(please note that you cannot cancel out y from both sides
without knowing that y != 0)

So, either y = 0 or x = y. 0 is an integer, so we cannot rule out y=0

2 - insufficient as well.
Take x = y = 5. Ofcourse x = y
Take x = 5 and y = -5. x is not equal to y

Taking both together, we know x = y.

I'd vote for C

Can someone please correct me if there's something amiss in my
reasoning.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 174
Joined: Mon Mar 26, 2007 5:51 am
Thanked: 1 times

by 800GMAT » Sat May 19, 2007 6:10 pm
I completely agree with jayhawk's reasoning

I do not understand how the OA can be D

It should be C!!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1