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 →

If P and Q are each Circular Regions, what is the radius..

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 2
Joined: Wed Jun 08, 2011 9:42 am
by ndesa » Fri Jun 24, 2011 5:16 pm
If P and Q are each circular regions, what is the radius of the larger of these regions?

(1) The area of P plus the area of Q is equal to 90pi.
(2) The larger circular region has a radius that is 3 times the radius of the smaller circular region.

Why is Statement 1 not sufficient?

Aren't r=3 and r=9 the only two radii that will fulfill the answer to the equation = 90pi?

I arrived at those numbers (3 and 9) just through basic plugging in. So Statement 1 seems sufficient to me.

Actual answer is: C

What gives?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1325
Joined: Sun Nov 01, 2009 6:24 amFollowed by: 14 members
Thanked: 105 times

by vikram4689 » Fri Jun 24, 2011 5:59 pm
U made the mistake of considering numbers as integers.

for x2 + y2 = 90.... we have infinite pair of x and y
Premise: If you like my post
Conclusion : Press the Thanks Button ;)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Newbie | Next Rank: 10 Posts
Posts: 9
Joined: Mon Apr 18, 2011 10:18 am

by vaibhavdoshi » Mon Jun 27, 2011 9:26 am
IMO C
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 135
Joined: Thu May 05, 2011 9:00 amFollowed by: 1 member
Thanked: 4 times
GMAT Score:700

by mirantdon » Mon Jun 27, 2011 10:23 am
imo c.
Need both the statement together

pi*r^2 +pi*(3r)^2 =90 pi
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 116
Joined: Tue May 31, 2011 7:52 pmFollowed by: 2 members
Location: Bangalore, India
Thanked: 2 times

by Sanjay2706 » Tue Jun 28, 2011 1:53 am
IMO C.
It's quite clear coz in the first statement, there can be multiple values.
When we take both statements, we can solve the question.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1