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

It is currently 21 Nov 2018, 10:10

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
Events & Promotions in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • All GMAT Club Tests are Free and open on November 22nd in celebration of Thanksgiving Day!

     November 22, 2018

     November 22, 2018

     10:00 PM PST

     11:00 PM PST

    Mark your calendars - All GMAT Club Tests are free and open November 22nd to celebrate Thanksgiving Day! Access will be available from 0:01 AM to 11:59 PM, Pacific Time (USA)
  • Key Strategies to Master GMAT SC

     November 24, 2018

     November 24, 2018

     07:00 AM PST

     09:00 AM PST

    Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

M70-35

  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: 50730
M70-35  [#permalink]

Show Tags

New post 04 Sep 2018, 01:31
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

67% (01:21) correct 33% (01:14) wrong based on 6 sessions

HideShow timer Statistics

Image
Both circles in the figure above have the same center, and the difference between their radii is 6. What is the outer circle’s radius?



(1) The outer circle’s area is 9 times the inner circle’s area.

(2) The inner circle’s circumference is \(\frac{1}{3}\) the outer circle’s circumference.

_________________

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

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50730
Re M70-35  [#permalink]

Show Tags

New post 04 Sep 2018, 01:31
Official Solution:


We’ll go for LOGICAL because that is our first choice in Data Sufficiency.

We have the gap between the radii but no other numbers; the outer circle’s radius is 6 more than inner circle’s radius. So, if we can calculate one, we’d know the other.

(1) Using the ratio between areas we can calculate the ratio between the radii (areas \(x^2:y^2\) --> radii \(x:y\)). With the ratio between the different radii we can express the small radii as a fraction of the large one, and together with the difference between them we can build an equation with one variable – sufficient! (B), (C) and (E) are eliminated.

(2) Again, using the given information, we can calculate the ratio between the radii. Now, just as in (1), we can create an equation with one variable to get the result we need. Sufficient. (A) is eliminated.


Answer: D
_________________

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

Senior Manager
Senior Manager
avatar
G
Joined: 15 Oct 2017
Posts: 311
Reviews Badge CAT Tests
Re: M70-35  [#permalink]

Show Tags

New post 04 Sep 2018, 11:25
1
Hi Bunuel, the answer should be D. Please check.
Senior Manager
Senior Manager
User avatar
P
Joined: 08 Jun 2013
Posts: 478
Location: India
Schools: INSEAD Jan '19
GMAT 1: 200 Q1 V1
GPA: 3.82
WE: Engineering (Other)
GMAT ToolKit User Premium Member
Re: M70-35  [#permalink]

Show Tags

New post 04 Sep 2018, 16:54
1
Bunuel wrote:
Official Solution:


We’ll go for LOGICAL because that is our first choice in Data Sufficiency.

We have the gap between the radii but no other numbers; the outer circle’s radius is 6 more than inner circle’s radius. So, if we can calculate one, we’d know the other.

(1) Using the ratio between areas we can calculate the ratio between the radii (areas \(x^2:y^2\) --> radii \(x:y\)). With the ratio between the different radii we can express the small radii as a fraction of the large one, and together with the difference between them we can build an equation with one variable – sufficient! (B), (C) and (E) are eliminated.

(2) Again, using the given information, we can calculate the ratio between the radii. Now, just as in (1), we can create an equation with one variable to get the result we need. Sufficient. (D) is eliminated.


Answer: A


Hey Bunuel

Pl check OA.

OE and OA doesn't match.

Thnx.

Posted from my mobile device
_________________

It seems Kudos button not working correctly with all my posts...

Please check if it is working with this post......

is it?....

Anyways...Thanks for trying :cool:

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50730
Re: M70-35  [#permalink]

Show Tags

New post 04 Sep 2018, 19:56
Harshgmat wrote:
Bunuel wrote:
Official Solution:


We’ll go for LOGICAL because that is our first choice in Data Sufficiency.

We have the gap between the radii but no other numbers; the outer circle’s radius is 6 more than inner circle’s radius. So, if we can calculate one, we’d know the other.

(1) Using the ratio between areas we can calculate the ratio between the radii (areas \(x^2:y^2\) --> radii \(x:y\)). With the ratio between the different radii we can express the small radii as a fraction of the large one, and together with the difference between them we can build an equation with one variable – sufficient! (B), (C) and (E) are eliminated.

(2) Again, using the given information, we can calculate the ratio between the radii. Now, just as in (1), we can create an equation with one variable to get the result we need. Sufficient. (D) is eliminated.


Answer: A


Hey Bunuel

Pl check OA.

OE and OA doesn't match.

Thnx.

Posted from my mobile device

_____________________
Edited the OA. Thank you.
_________________

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

GMAT Club Bot
Re: M70-35 &nbs [#permalink] 04 Sep 2018, 19:56
Display posts from previous: Sort by

M70-35

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

Moderators: chetan2u, Bunuel



Copyright

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®.