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

 It is currently 22 Sep 2018, 00:26

### 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

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

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

### Show Tags

30 Aug 2018, 04:53
00:00

Difficulty:

35% (medium)

Question Stats:

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

### HideShow timer Statistics

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 [ 587 Bytes | Viewed 215 times ]

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

### Show Tags

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:

Insufficient.

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

### Show Tags

30 Aug 2018, 07:05
Bunuel wrote:

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

 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®.