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

It is currently 17 Nov 2018, 03:39

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
  • FREE Quant Workshop by e-GMAT!

     November 18, 2018

     November 18, 2018

     07:00 AM PST

     09:00 AM PST

    Get personalized insights on how to achieve your Target Quant Score. November 18th, 7 AM PST
  • How to QUICKLY Solve GMAT Questions - GMAT Club Chat

     November 20, 2018

     November 20, 2018

     09:00 AM PST

     10:00 AM PST

    The reward for signing up with the registration form and attending the chat is: 6 free examPAL quizzes to practice your new skills after the chat.

Is x(y/z) > 0?

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

Hide Tags

Senior Manager
Senior Manager
User avatar
P
Joined: 23 Jun 2012
Posts: 385
Location: Pakistan
Concentration: Strategy, International Business
GPA: 3.76
GMAT ToolKit User Reviews Badge CAT Tests
Is x(y/z) > 0?  [#permalink]

Show Tags

New post Updated on: 26 Dec 2013, 02:53
1
1
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

78% (01:17) correct 22% (01:13) wrong based on 205 sessions

HideShow timer Statistics

Is x(y/z) > 0?

(1) xyz > 0
(2) yz > 0

_________________

Push yourself again and again. Don't give an inch until the final buzzer sounds. -Larry Bird
Success isn't something that just happens - success is learned, success is practiced and then it is shared. -Sparky Anderson
-S


Originally posted by sananoor on 29 Dec 2012, 07:51.
Last edited by Bunuel on 26 Dec 2013, 02:53, edited 1 time in total.
Edited the OA.
Board of Directors
User avatar
P
Joined: 01 Sep 2010
Posts: 3306
Re: Is x(y/z) > 0?  [#permalink]

Show Tags

New post 29 Dec 2012, 09:52
sananoor wrote:
Is x(y/z) > 0?

(1) xyz > 0
(2) yz > 0



Statement\(\frac{xy}{z}\) \(>0\) both are positive or negative (the numerator and the denominator)

1) \(xyz\) \(> 0\) this says that our variables are both positive or negative but we can't determine which of them are positive or negative

2) the product of \(y*z\) are both positive or negative

1) + 2) we still do not know which of our variable are positive or negative

E is the best
_________________

COLLECTION OF QUESTIONS AND RESOURCES
Quant: 1. ALL GMATPrep questions Quant/Verbal 2. Bunuel Signature Collection - The Next Generation 3. Bunuel Signature Collection ALL-IN-ONE WITH SOLUTIONS 4. Veritas Prep Blog PDF Version 5. MGMAT Study Hall Thursdays with Ron Quant Videos
Verbal:1. Verbal question bank and directories by Carcass 2. MGMAT Study Hall Thursdays with Ron Verbal Videos 3. Critical Reasoning_Oldy but goldy question banks 4. Sentence Correction_Oldy but goldy question banks 5. Reading-comprehension_Oldy but goldy question banks

Senior Manager
Senior Manager
User avatar
P
Joined: 23 Jun 2012
Posts: 385
Location: Pakistan
Concentration: Strategy, International Business
GPA: 3.76
GMAT ToolKit User Reviews Badge CAT Tests
Re: Is x(y/z) > 0?  [#permalink]

Show Tags

New post 29 Dec 2012, 10:17
statement 1) says xyz> 0 from this we conclude that either all three are positive or two are negative. statement 2 says that yz> 0 it means either both are negative or positive....by combining two statements we come to know that x is positive...x cant be negative in order to make the statement one right....xyz>0 and yz> 0....so x is positive...y and z are either positive or negative....x(y/z) >0 if y and z are negative then negative signs cancel each other and answer could be greater than 0...i am so much confused regarding this question...:(
_________________

Push yourself again and again. Don't give an inch until the final buzzer sounds. -Larry Bird
Success isn't something that just happens - success is learned, success is practiced and then it is shared. -Sparky Anderson
-S

Intern
Intern
avatar
Joined: 18 Dec 2011
Posts: 2
Re: Is x(y/z) > 0?  [#permalink]

Show Tags

New post 30 Dec 2012, 01:23
1
guys, dont think E is the correct answer... As per me , its A

here is the explanation:

1) it says xyz>0 which means either two of these variables are negative or all three are positive...you can take out any combinations from these and you will find out that every combination gives you x (y/z) >0.. so, this seems sufficient

2) yz>0 doesn't give any information about x so insufficient
Manager
Manager
User avatar
Joined: 31 May 2012
Posts: 117
Re: Is x(y/z) > 0?  [#permalink]

Show Tags

New post 30 Dec 2012, 04:13
Is x(y/z) > 0?

(1) xyz > 0
(2) yz > 0


We need to know whether expression E= {x * y * (1/y)} positive or negative.
Let E = A*B*C where { A=x, B=y, C=1/y }
Expression will be -ve if, 1 OR 3 terms among A,B & C are –ve. That is..
1. Any 1 term out of of A,B and C is –ve and 2 are +ve. OR
2. All 3 A, B & C are –ve.

Option 1: xyz>0..
Again we can write this as ABC>0.. So, this option is sufficient. Multiplication and Division provide similar signs.

Option 2: yz>0.
This means, Both y & z are –ve Or Both are +ve. We can’t determine whether x(y/z)>0.

Answer is A.
Intern
Intern
avatar
Joined: 21 Mar 2009
Posts: 19
Re: Is x(y/z) > 0?  [#permalink]

Show Tags

New post 31 Dec 2012, 06:13
sananoor wrote:
Is x(y/z) > 0?

(1) xyz > 0
(2) yz > 0



Multiplication or division doesn't change the sign of a term. So x(y/z) or xyz or any formation of xyz will be same as long as one of that is established.

In option 1. xyz>0 is sufficient to determine thus that x(y/z) > 0. Suff

Option 2, nithing is known about x so not suff.

Ans A
SVP
SVP
User avatar
Joined: 06 Sep 2013
Posts: 1745
Concentration: Finance
GMAT ToolKit User
Re: Is x(y/z) > 0?  [#permalink]

Show Tags

New post 25 Dec 2013, 16:17
sananoor wrote:
Is x(y/z) > 0?

(1) xyz > 0
(2) yz > 0


So is it A or E finally?

Cheers!
J :)
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50621
Re: Is x(y/z) > 0?  [#permalink]

Show Tags

New post 26 Dec 2013, 02:58
jlgdr wrote:
sananoor wrote:
Is x(y/z) > 0?

(1) xyz > 0
(2) yz > 0


So is it A or E finally?

Cheers!
J :)


Correct answer is A. Edited the OA. Thank you.

Is x(y/z) > 0?

We need to find whether x*y*1/z is positive.


(1) xyz > 0. Since z and 1/z have the same sign, then this statement implies that x*y*1/z > 0. Sufficient.

(2) yz > 0. If x > 0, then x*y*1/z is positive but if x <= 0, then x*y*1/z is not positive. Not sufficient.

Answer: A.

Hope it's clear.
_________________

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

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 8800
Premium Member
Re: Is x(y/z) > 0?  [#permalink]

Show Tags

New post 20 Mar 2018, 16:57
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

GMAT Club Bot
Re: Is x(y/z) > 0? &nbs [#permalink] 20 Mar 2018, 16:57
Display posts from previous: Sort by

Is x(y/z) > 0?

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


cron
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®.