GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 22 Sep 2018, 00:26

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

What is the ratio of the circumference of the outer circle to that of

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 49300
What is the ratio of the circumference of the outer circle to that of  [#permalink]

Show Tags

New post 30 Aug 2018, 04:53
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

82% (00:31) correct 18% (00:36) wrong based on 17 sessions

HideShow timer Statistics

Image
What is the ratio of the circumference of the outer circle to that of the inner circle?

(1) The area of the outer circle is 4 times the area of the inner circle.
(2) The circles share the same center.

Attachment:
image001.gif
image001.gif [ 587 Bytes | Viewed 215 times ]

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Manager
Manager
User avatar
G
Joined: 18 Jul 2018
Posts: 192
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Premium Member CAT Tests
What is the ratio of the circumference of the outer circle to that of  [#permalink]

Show Tags

New post 30 Aug 2018, 06:50
Let R be the radius of the outer circle.

Let r be the radius of the smaller circle.

From statement 1:

Given Pi*\(R^2\) = 4*Pi*\(r^2\)

Then \((\frac{R}{r})^2\) = 4

\(\frac{R}{r}\) = 2

Circumference = \(\frac{2*Pi*R}{2*Pi*r}\) = \(\frac{R}{r}\) = 2.

Ratio becomes 2:1

1 is sufficient.

From statement 2:

No info about radius.
Insufficient.

A is the answer.
Director
Director
User avatar
P
Status: Learning stage
Joined: 01 Oct 2017
Posts: 857
WE: Supply Chain Management (Energy and Utilities)
Premium Member CAT Tests
Re: What is the ratio of the circumference of the outer circle to that of  [#permalink]

Show Tags

New post 30 Aug 2018, 07:05
Bunuel wrote:
Image
What is the ratio of the circumference of the outer circle to that of the inner circle?

(1) The area of the outer circle is 4 times the area of the inner circle.
(2) The circles share the same center.

Attachment:
image001.gif


Question stem:- What is the ratio of the circumference of the outer circle to that of the inner circle?
Or, what is the ratio of outer radius and inner radius?
Requirement:- 1)values of the two radii or 2) relationship between radii

St1:-The area of the outer circle is 4 times the area of the inner circle.
Here, relationship between radii is given.
Sufficient.

St2:- The circles share the same center.
Neither of the required info is given,
Insufficient.

Ans. (A)
_________________

Regards,

PKN

Rise above the storm, you will find the sunshine

Re: What is the ratio of the circumference of the outer circle to that of &nbs [#permalink] 30 Aug 2018, 07:05
Display posts from previous: Sort by

What is the ratio of the circumference of the outer circle to that of

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  

Events & Promotions

PREV
NEXT


cron

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.