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

It is currently 22 Aug 2014, 03:54

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

Is x a negative number?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 19046
Followers: 3367

Kudos [?]: 24493 [0], given: 2680

Is x a negative number? [#permalink] New post 06 Aug 2012, 02:11
Expert's post
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

87% (01:33) correct 13% (00:55) wrong based on 233 sessions
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 19046
Followers: 3367

Kudos [?]: 24493 [0], given: 2680

Re: Is x a negative number? [#permalink] New post 06 Aug 2012, 02:11
Expert's post
Manager
Manager
avatar
Joined: 05 Jan 2011
Posts: 60
Followers: 0

Kudos [?]: 9 [0], given: 7

Re: Is x a negative number? [#permalink] New post 06 Aug 2012, 06:45
From Statement -1 : 9 X > 10 X
Case -1 :Assuming X > 0
Dividing by X , 9>10 - Which is no true - So X <0 - Sufficient

Case-2 : X+3 >0
i.e X> -3 ....X can be any number greater than -3 -Not sufficient

Answer -
[Reveal] Spoiler:
A
1 KUDOS received
Manager
Manager
avatar
Joined: 05 Jul 2012
Posts: 83
Location: India
Concentration: Finance, Strategy
GMAT Date: 09-30-2012
GPA: 3.08
WE: Engineering (Energy and Utilities)
Followers: 4

Kudos [?]: 18 [1] , given: 8

Re: Is x a negative number? [#permalink] New post 06 Aug 2012, 06:57
1
This post received
KUDOS
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Is x a negative number?

(1) 9x > 10x
(2) x + 3 is positive.

Practice Questions
Question: 13
Page: 276
Difficulty: 550


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!


Now let us take it down fat and very fast, cos this is a very wussy question where we have to save time for the other tough problems we should not take more than 10 seconds to solve it .
9x>10x implies x < 0 9 (Awesome )
x+3 > 0 implies x > -3 ( not good )
Answer is A
Senior Manager
Senior Manager
avatar
Joined: 15 Jun 2010
Posts: 363
Schools: IE'14, ISB'14, Kellogg'15
WE 1: 7 Yrs in Automobile (Commercial Vehicle industry)
Followers: 6

Kudos [?]: 145 [0], given: 50

GMAT Tests User Reviews Badge
Re: Is x a negative number? [#permalink] New post 06 Aug 2012, 07:35
IMO A

st 1: sufficient x is -ve
st 2: not sufficient x can be +ve, -ve or zero
_________________

Regards
SD
-----------------------------
Press Kudos if you like my post.
Debrief 610-540-580-710(Long Journey): from-600-540-580-710-finally-achieved-in-4th-attempt-142456.html

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 19046
Followers: 3367

Kudos [?]: 24493 [0], given: 2680

Re: Is x a negative number? [#permalink] New post 10 Aug 2012, 03:58
Expert's post
Expert Post
Moderator
Moderator
User avatar
Joined: 01 Sep 2010
Posts: 2368
Followers: 266

Kudos [?]: 2253 [0], given: 690

Is x a negative number? [#permalink] New post 22 Sep 2012, 16:08
Expert's post
Is x a negative number?

(1) 9x > 10x
(2) x + 3 is positive.

i would like to know if my process is correct

1) 9x - 10x >0 ----> x (9-10) > 0 -----> x > 0 suff

2) x + 3 = pos x can be a positive value 4 + 3 = 7 or negative -1 + 3 = 2 always positive insuff

In particular I wish to know about the first stat.

Thanks
_________________

COLLECTION OF QUESTIONS
Quant: 1. Bunuel Signature Collection - The Next Generation 2. Bunuel Signature Collection ALL-IN-ONE WITH SOLUTIONS 3. Veritas Prep Blog PDF Version
Verbal:1. Best EXTERNAL resources to tackle the GMAT Verbal Section 2. e-GMAT's ALL CR topics-Consolidated 3. New Critical Reasoning question bank by carcass 4. Meaning/Clarity SC Question Bank by Carcass_Souvik 5. e-GMAT's ALL SC topics-Consolidated-2nd Edition 6. The best reading to improve Reading Comprehension
7. VERBAL QUESTION BANK and Directories

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 19046
Followers: 3367

Kudos [?]: 24493 [0], given: 2680

Re: Is x a negative number? [#permalink] New post 22 Sep 2012, 21:52
Expert's post
carcass wrote:
Is x a negative number?

(1) 9x > 10x
(2) x + 3 is positive.

i would like to know if my process is correct

1) 9x - 10x >0 ----> x (9-10) > 0 -----> x > 0 suff

2) x + 3 = pos x can be a positive value 4 + 3 = 7 or negative -1 + 3 = 2 always positive insuff

In particular I wish to know about the first stat.

Thanks


Merging similar topics. Please refer to the solutions above and ask if anything remains unclear.
_________________

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

VP
VP
avatar
Status: Final Lap Up!!!
Affiliations: NYK Line
Joined: 21 Sep 2012
Posts: 1096
Location: India
GMAT 1: 410 Q35 V11
GMAT 2: 530 Q44 V20
GMAT 3: 630 Q45 V31
GPA: 3.84
WE: Engineering (Transportation)
Followers: 32

Kudos [?]: 247 [0], given: 67

Re: Is x a negative number? [#permalink] New post 22 Sep 2012, 22:24
9x>10X only if x is -ve it cant be greater when x is + ve
hence 1 is sufficient
but statement 2 is insufficient as x can hav the value as 0 and any + ve num
zero is neither +ve nor - ve
hence insufficient
A is the answer
Expert Post
Moderator
Moderator
User avatar
Joined: 01 Sep 2010
Posts: 2368
Followers: 266

Kudos [?]: 2253 [0], given: 690

Re: Is x a negative number? [#permalink] New post 23 Sep 2012, 04:00
Expert's post
Bunuel wrote:
SOLUTION

Is x a negative number?

(1) 9x > 10x --> rearrange: 0>10x-9x --> 0>x. Sufficient.
(2) x + 3 is positive --> x+3>0 --> x>-3. Not sufficient.

Answer: A.


Hi Bunuel.

What is unclear for me is not the probelm by itself (I picked the right answer but the first statement

1) 0 > of something then X must be negative. The answer is definitevely YES.

Instead, I have obtained YES too but X is definetevely positive. In this scenario is the same, the most imprtant thing is to have a definitive answer, or is wrong thinking in this way??

Thanks
_________________

COLLECTION OF QUESTIONS
Quant: 1. Bunuel Signature Collection - The Next Generation 2. Bunuel Signature Collection ALL-IN-ONE WITH SOLUTIONS 3. Veritas Prep Blog PDF Version
Verbal:1. Best EXTERNAL resources to tackle the GMAT Verbal Section 2. e-GMAT's ALL CR topics-Consolidated 3. New Critical Reasoning question bank by carcass 4. Meaning/Clarity SC Question Bank by Carcass_Souvik 5. e-GMAT's ALL SC topics-Consolidated-2nd Edition 6. The best reading to improve Reading Comprehension
7. VERBAL QUESTION BANK and Directories

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 19046
Followers: 3367

Kudos [?]: 24493 [0], given: 2680

Re: Is x a negative number? [#permalink] New post 24 Sep 2012, 03:04
Expert's post
carcass wrote:
Bunuel wrote:
SOLUTION

Is x a negative number?

(1) 9x > 10x --> rearrange: 0>10x-9x --> 0>x. Sufficient.
(2) x + 3 is positive --> x+3>0 --> x>-3. Not sufficient.

Answer: A.


Hi Bunuel.

What is unclear for me is not the probelm by itself (I picked the right answer but the first statement

1) 0 > of something then X must be negative. The answer is definitevely YES.

Instead, I have obtained YES too but X is definetevely positive. In this scenario is the same, the most imprtant thing is to have a definitive answer, or is wrong thinking in this way??

Thanks


Well, from (1) we have that x<0, so x is negative not positive.

As for your question: in a Yes/No Data Sufficiency question, statement(s) is sufficient if the answer is “always yes” or “always no” while a statement(s) is insufficient if the answer is "sometimes yes" and "sometimes no".

Hope it's clear.
_________________

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

Manager
Manager
User avatar
Joined: 12 Jan 2013
Posts: 249
Followers: 0

Kudos [?]: 18 [0], given: 47

GMAT ToolKit User
Re: Is x a negative number? [#permalink] New post 10 Jan 2014, 06:57
Bunuel wrote:
Is x a negative number?

(1) 9x > 10x
(2) x + 3 is positive.

Practice Questions
Question: 13
Page: 276
Difficulty: 550



1) tells us that 0 > 10x - 9x ---> 0 > x , so 1 is sufficient
2) x could be 1 or -1, for instance.. So insufficient..

We go with A
Re: Is x a negative number?   [#permalink] 10 Jan 2014, 06:57
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic If x is a negative number, what is the value of x? goodyear2013 1 29 Mar 2014, 15:05
8 Experts publish their posts in the topic If x and y are negative numbers, is x<y? nitin6305 4 13 Aug 2013, 10:44
Experts publish their posts in the topic if x and y are negative numbers, is x<y yezz 1 15 May 2013, 08:09
Is x a negative number? hogann 5 10 Oct 2009, 14:01
1 Is x a negative number? (1) x2 is a positive number. (2) x prinits 12 31 May 2009, 06:23
Display posts from previous: Sort by

Is x a negative number?

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.