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

It is currently 18 Nov 2018, 21:43

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
  • 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.
  • The winning strategy for 700+ on the GMAT

     November 20, 2018

     November 20, 2018

     06:00 PM EST

     07:00 PM EST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.

Is x^2y^3w^4z^1 < 0 ?

  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: 50627
Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 20 Apr 2016, 00:09
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

32% (00:57) correct 68% (00:49) wrong based on 76 sessions

HideShow timer Statistics

Intern
Intern
avatar
Joined: 17 Apr 2016
Posts: 19
Re: Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 20 Apr 2016, 00:36
Its really a good post. I would willingly be waited to get the answer of this question.
Manager
Manager
avatar
G
Joined: 04 Apr 2015
Posts: 107
Re: Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 20 Apr 2016, 06:35
1
IMO E

A)yz<0, but w or x can be zero so the term can be equal to zero or less so in suff, same goes for B, and A+B
Current Student
User avatar
Joined: 18 Oct 2014
Posts: 855
Location: United States
GMAT 1: 660 Q49 V31
GPA: 3.98
GMAT ToolKit User
Re: Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 20 Apr 2016, 09:25
IMO 'A'

yz<0 means that both 'y' and 'z' have opposite signs. And since in the question stem the powers of both these are odd, they will retain their original powers. And, hence the product of the question stem will be -ve.
_________________

I welcome critical analysis of my post!! That will help me reach 700+

Manager
Manager
avatar
S
Joined: 13 Mar 2013
Posts: 165
Location: United States
Concentration: Leadership, Technology
GPA: 3.5
WE: Engineering (Telecommunications)
Re: Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 20 Apr 2016, 11:12
Is x2y3w4z1<0x2y3w4z1<0 ?

(1) yz < 0
(2) z < 0

Take the question -- x, w will always be positive . since even power .

Therefore question becomes y^3 z^1 < 0

1) yz < 0
either y or z is negative . Hence sufficient

2) z<0 . Here we dont know about y .
Hence not sufficient .

Ans is A
Press Kudos if you like my post .
_________________

Regards ,

Intern
Intern
avatar
B
Joined: 11 Mar 2014
Posts: 25
Schools: HEC Montreal '20
Reviews Badge
Re: Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 20 Apr 2016, 19:24
ans e
1)yz<0 hence either y<0 or z<0 but no mention of w,,x they can be 0
2 z<0 same reason
combined still we get y>0 z,0 stil x and w can zero
hence equation can = 0 or less than zero
hence E
Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 7037
Re: Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 20 Apr 2016, 20:10
2
Bunuel wrote:
Is \(x^2y^3w^4z^1 < 0\) ?

(1) yz < 0
(2) z < 0


Hi,
there are two sets of answer-
1) A as the answer --- Not speaking about any of the variables being 0..
2) E as the answer--- Correctly taking 0 as an option for variables ..


lets see the equation first and what is required..


\(x^2y^3w^4z^1 < 0\)
1) when all are non-zero integers..
\(x^2w^4\) will be > 0, we have to check if y and z are of opposite sign..

2) if any of the integer is 0..
if any integer is zero, entire equation will be 0
AND our answer to "Is \(x^2y^3w^4z^1 < 0\) ?" will be NO..
and suff..

lets see the statements-


(1) yz < 0
this shows that y and z are of opposite sign, so ans is YES..
But say x is 0, then ans will be NO..
Insuff

HAD the q been \(x^2y^3w^4z^1 > 0\), this statement would have been suff as ans would be NO in both cases, but not NOW

(2) z < 0
Clearly insuff

Combined,
still insuff as the cases as shown in statement 1 still remain
E
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


GMAT online Tutor

Intern
Intern
avatar
B
Joined: 16 Jun 2018
Posts: 24
GMAT 1: 640 Q49 V29
GPA: 4
WE: Supply Chain Management (Energy and Utilities)
CAT Tests
Re: Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 25 Aug 2018, 23:24
Statement 1: yz<0.
As per the question, x^2 & w^4 would always be positive for all values excluding 0. So, As per st. 1, the expression could be <0 or =0. Insufficient.
Statement 2: z<0
Again the same we don't know about x and w whether they are Non-zero.

Combining both the statement we don't have any information on x and w whether they are non zero.

Answer - E.
Senior Manager
Senior Manager
avatar
P
Joined: 31 Jul 2017
Posts: 494
Location: Malaysia
Schools: INSEAD Jan '19
GMAT 1: 700 Q50 V33
GPA: 3.95
WE: Consulting (Energy and Utilities)
Re: Is x^2y^3w^4z^1 < 0 ?  [#permalink]

Show Tags

New post 25 Aug 2018, 23:30
Bunuel wrote:
Is \(x^2y^3w^4z^1 < 0\) ?

(1) yz < 0
(2) z < 0


It should be E, for simple reason that \(W\) can be \(0\) and neither of the statements provide the Value of \(W\).
_________________

If my Post helps you in Gaining Knowledge, Help me with KUDOS.. !!

GMAT Club Bot
Re: Is x^2y^3w^4z^1 < 0 ? &nbs [#permalink] 25 Aug 2018, 23:30
Display posts from previous: Sort by

Is x^2y^3w^4z^1 < 0 ?

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


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®.