Find all School-related info fast with the new School-Specific MBA Forum

It is currently 20 Aug 2014, 15:06

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

700+ Quant DS.

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 26 Jan 2010
Posts: 7
Schools: Stanford, Wharton, Insead
Followers: 0

Kudos [?]: 0 [0], given: 0

700+ Quant DS. [#permalink] New post 09 Feb 2010, 08:55
Hey Fellows,
Try this question.

Is a^2 + b^2 >= 130?

1. a/b = 3/11.
2. a < 3.

OA
[Reveal] Spoiler:
E
.

Last edited by punzoo on 09 Feb 2010, 09:43, edited 1 time in total.
Director
Director
User avatar
Joined: 27 Jun 2008
Posts: 549
WE 1: Investment Banking - 6yrs
Followers: 1

Kudos [?]: 45 [0], given: 92

GMAT Tests User
Re: 700+ Quant DS. [#permalink] New post 09 Feb 2010, 09:00
punzoo wrote:
Hey Fellows,
Try this question.

Is a^2 + b^2 >= 130?

1. a/b = 3/7.
2. a < 3.

OA
[Reveal] Spoiler:
E
.



E

1) It's a ratio, so a & b can be any number. Insuff
2) Not helpful; a = -infinity to +2. Insuff

combine, you get nothing.
Manager
Manager
avatar
Joined: 10 Feb 2010
Posts: 195
Followers: 2

Kudos [?]: 38 [0], given: 6

GMAT Tests User
Re: 700+ Quant DS. [#permalink] New post 12 Feb 2010, 19:00
Ans:E

1. a/b = 3/11.
when a=6, b=22 then a^2 + b^2>130
when a=.6, b=2.2 then a^2 + b^2<130
So insufficient

2. a < 3.
when a=.6, b=2.2 then a^2 + b^2<130
when a=-6, b=-22 then a^2 + b^2>130
So insufficient
CEO
CEO
User avatar
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2793
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Followers: 178

Kudos [?]: 922 [0], given: 235

GMAT Tests User Reviews Badge
Re: 700+ Quant DS. [#permalink] New post 12 Feb 2010, 23:16
punzoo wrote:
Hey Fellows,
Try this question.

Is a^2 + b^2 >= 130?

1. a/b = 3/11.
2. a < 3.

OA
[Reveal] Spoiler:
E
.


I m confused between C n E. pls letme know where I m wrong.

clearly 2nd eq is not sufficient.
Take 1st eq... take a=3x and b =11x

put in the question.....we get 9x^2 + 121x^2 >= 130

=> 130x^2 >=130
x^2>=1, thus we need to know whether this satisfy or not.
If we consider eq 2... a<3 that means x<1

Thus this should be C...but one case when x=1 we hav not consider this might take it to E.
Pls advice.
_________________

Fight for your dreams :For all those who fear from Verbal- lets give it a fight

Money Saved is the Money Earned :)

Jo Bole So Nihaal , Sat Shri Akaal

:thanks Support GMAT Club by putting a GMAT Club badge on your blog/Facebook :thanks

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Gmat test review :
670-to-710-a-long-journey-without-destination-still-happy-141642.html

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 19030
Followers: 3361

Kudos [?]: 24397 [0], given: 2677

Re: 700+ Quant DS. [#permalink] New post 13 Feb 2010, 05:29
Expert's post
gurpreetsingh wrote:
punzoo wrote:
Hey Fellows,
Try this question.

Is a^2 + b^2 >= 130?

1. a/b = 3/11.
2. a < 3.

OA
[Reveal] Spoiler:
E
.


I m confused between C n E. pls letme know where I m wrong.

clearly 2nd eq is not sufficient.
Take 1st eq... take a=3x and b =11x

put in the question.....we get 9x^2 + 121x^2 >= 130

=> 130x^2 >=130
x^2>=1, thus we need to know whether this satisfy or not.
If we consider eq 2... a<3 that means x<1

Thus this should be C...but one case when x=1 we hav not consider this might take it to E.
Pls advice.


You did everything right, except the last step: x^2\geq{1} --> x\leq{-1} or x\geq{1} --> a\leq{-3} or a\geq{3}. So still E.

You can use number plugging when considering statements together: For a=0.3 and b=1.1 answer is NO, but for a=-3 and b=-11 answer is YES.

Hope it helps.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

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?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: 700+ Quant DS.   [#permalink] 13 Feb 2010, 05:29
    Similar topics Author Replies Last post
Similar
Topics:
700-Level Quant? Stoneface 4 11 Mar 2012, 19:09
206 Experts publish their posts in the topic Quant 700-800 questions(PS+DS) with solutions satishchandraaily 60 11 Nov 2011, 20:24
700 GMAT but low quant EChopeful12 2 25 Jun 2010, 09:01
700 plus quants questions ronniebassist 2 27 Oct 2009, 15:07
Quant DS xlick 1 06 Mar 2009, 18:46
Display posts from previous: Sort by

700+ Quant DS.

  Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: Bunuel, WoundedTiger



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

Powered by phpBB © phpBB Group and phpBB SEO

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®.