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

It is currently 01 Sep 2014, 05:49

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

If x*y*z=0, what is the value of z/y*y? (1) x=3*y/4, (2)

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
User avatar
Joined: 13 Jan 2005
Posts: 39
Location: Moscow, Russia
Followers: 1

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

If x*y*z=0, what is the value of z/y*y? (1) x=3*y/4, (2) [#permalink] New post 13 Jan 2005, 00:20
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 0 sessions
If x*y*z=0, what is the value of z/y*y? (1) x=3*y/4, (2) z=2*x/3
Senior Manager
Senior Manager
avatar
Joined: 22 Jun 2004
Posts: 394
Location: Bangalore, India
Followers: 1

Kudos [?]: 1 [0], given: 0

GMAT Tests User
Re: DS [#permalink] New post 13 Jan 2005, 00:53
I got it as C.

z/y*y = z (by applying PEMDAS)
So, we need to find out the value of z.

I is not sufficient because two equations and three variables.

II is not sufficient because two equations and three variables.

But, I and II together have three equations (along with xyz = 0) and three variables.

z = 2x/3 => x = 3z/2
x = 3y/4 => y = 4x/3 = (4/3) (3z/2) = 2z

xyz = 0 => 3z/2 * 2z * z = 0 => 3*(z^3) = 0 => z = 0;

So, I and II are sufficient together. => The answer is C.

MoscowFuturist wrote:
If x*y*z=0, what is the value of z/y*y? (1) x=3*y/4, (2) z=2*x/3

_________________

Awaiting response,

Thnx & Rgds,
Chandra

Intern
Intern
User avatar
Joined: 13 Jan 2005
Posts: 39
Location: Moscow, Russia
Followers: 1

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

 [#permalink] New post 13 Jan 2005, 01:50
Sorry, may be I uncorrectly write the problem

If x*y*z=0, what is the value of z/(y*y)? (1) x=(3*y)/4, (2) z=(2*x)/3.
Senior Manager
Senior Manager
avatar
Joined: 22 Jun 2004
Posts: 394
Location: Bangalore, India
Followers: 1

Kudos [?]: 1 [0], given: 0

GMAT Tests User
 [#permalink] New post 13 Jan 2005, 01:59
Then I am getting it as E. as z/(y*y) = 1/4z (by plugging in I and II) and z = 0. 1/4z cannot be found out.


MoscowFuturist wrote:
Sorry, may be I uncorrectly write the problem

If x*y*z=0, what is the value of z/(y*y)? (1) x=(3*y)/4, (2) z=(2*x)/3.

_________________

Awaiting response,

Thnx & Rgds,
Chandra

Intern
Intern
User avatar
Joined: 13 Jan 2005
Posts: 39
Location: Moscow, Russia
Followers: 1

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

 [#permalink] New post 13 Jan 2005, 04:10
My answer is D, but GMAT Plus Answer is E. With whom do you agree?

My reasoning is that division by y means that y is not zero. 1 or 2 suggest that both x and z are zero.
Manager
Manager
avatar
Joined: 15 Jul 2004
Posts: 75
Location: London
Followers: 1

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

Re: DS [#permalink] New post 13 Jan 2005, 04:58
If the question said: y cannot be 0, then the answer would be D (z=0), but as it is written it doesn’t make sense:


(1) insuff. Either z=0 or x=y=0, but this makes no sense

(2) either x=z=0 or y =0

x=z=0 can happen, but y=0 makes no sense.

(1+2) x=y=z=0 No sense


So for me the answer is: badly written question, don’t bother!

If the question were: x*y*z not equal 0, then,

1. insuff,
2. insuff,
1+2: (z/y*y) = 1/4z insuff
Therefore E
Senior Manager
Senior Manager
avatar
Joined: 22 Jun 2004
Posts: 394
Location: Bangalore, India
Followers: 1

Kudos [?]: 1 [0], given: 0

GMAT Tests User
 [#permalink] New post 13 Jan 2005, 06:26
I donot think we can conclude that y != 0 unless the stem says so. Anyway, this is very tough query!!

MoscowFuturist wrote:
My answer is D, but GMAT Plus Answer is E. With whom do you agree?

My reasoning is that division by y means that y is not zero. 1 or 2 suggest that both x and z are zero.

_________________

Awaiting response,

Thnx & Rgds,
Chandra

Director
Director
User avatar
Joined: 31 Aug 2004
Posts: 609
Followers: 3

Kudos [?]: 21 [0], given: 0

GMAT Tests User
 [#permalink] New post 13 Jan 2005, 07:33
If x*y*z=0, what is the value of z/y*y = A ?

1st statement : x=3*y/4

Either z = 0 and/or (x or y = 0) problem is this ratio can be undetermined (possible answers are 0, +/- infinite, or 0/0)

So I do not know how to conclude

2nd statement : z=2*x/3

IMO same pb as the above one (y=0 or z=0)


Both statements : x=y=z=0, then A has no value.


I pick E.

Is this one from serious material ?
Intern
Intern
User avatar
Joined: 13 Jan 2005
Posts: 39
Location: Moscow, Russia
Followers: 1

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

 [#permalink] New post 13 Jan 2005, 23:07
I met this question in GMAT Plus, Set 1.

I think that this question refers to "know more - think more" principle :lol:
  [#permalink] 13 Jan 2005, 23:07
    Similar topics Author Replies Last post
Similar
Topics:
1 If x^3y^4 = 5000, what is the value of y? 1] y is positive vscid 11 20 Dec 2008, 19:48
x^3*y^4=2000.What is y? 1. x is an integer 2. y is an marcodonzelli 7 16 Feb 2008, 09:09
Experts publish their posts in the topic x^3(y^4)=2000 What is y? 1. X is an integer 2. Y is an bmwhype2 7 26 Nov 2007, 14:06
If x^3y^4=5000, what is the value of y? 1) y is positive; 2) Balvinder 7 27 Oct 2007, 06:14
y is odd, x^3*y^4=5000, what is y? 1) x is integer 2) y > gamjatang 2 28 Oct 2005, 05:35
Display posts from previous: Sort by

If x*y*z=0, what is the value of z/y*y? (1) x=3*y/4, (2)

  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®.