NEW HERE? LEARN MORE
closeclose
Last visit was: 28 Apr 2024, 23:58 It is currently 28 Apr 2024, 23:58
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2)

User avatar
B
kevincan
GMAT Instructor
Joined: 04 Jul 2006
Posts: 960
Own Kudos [?]: 693 [0]
Given Kudos: 6
Location: Madrid
 Q51  V50
Send PM
If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   01 Sep 2006, 09:02
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Hide Show timer Statistics
If 5x=3y=2z, is xyz>0?

(1) (xyz)^2 is an integer

(2) 2x+3y+z< 50



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
FN
Current Student
Joined: 28 Dec 2004
Posts: 1581
Own Kudos [?]: 642 [0]
Given Kudos: 2
Location: New York City
Concentration: Social Enterprise
Schools:Wharton'11 HBS'12
Send PM
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   01 Sep 2006, 09:29
is it E or am i missing somehting?
User avatar
B
yezz
Retired Moderator
Joined: 05 Jul 2006
Posts: 849
Own Kudos [?]: 1562 [0]
Given Kudos: 49
Send PM
GMAT ToolKit User
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   Updated on: 01 Sep 2006, 09:45
Well i will try to do my best on this one ... am still learning from you guys.specially both of you guys kevin and dahiya.

From the question stem x,y,z are all either +ve or -ve ( intigers or fractions)


from one... the square covers the signe of xyz and x,y,z are intigers and
... insuff

from 2 we do not have enough information about the signes of x,y,z
( specially that they could be fractions

Taking one and two ( from one) x,y,z are intigers and from question stem ..the least possible absolute values for x,y,z respectively is 6,10,15

thus sure that they are not all +ve Thus and putting into consideration the question stem they are all -ve... suff
thus my answer is c

Originally posted by yezz on 01 Sep 2006, 09:32.
Last edited by yezz on 01 Sep 2006, 09:45, edited 2 times in total.
User avatar
FN
Current Student
Joined: 28 Dec 2004
Posts: 1581
Own Kudos [?]: 642 [0]
Given Kudos: 2
Location: New York City
Concentration: Social Enterprise
Schools:Wharton'11 HBS'12
Send PM
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   01 Sep 2006, 09:35
stem 2 jus says the sum is less 50..it cud be -50 for all we know

yezz wrote:
Well i will try to do my best on this one ... am still learning from you guys.specially both of you guys kevin and dahiya.

From the question stem x,y,z are all either +ve or -ve

and the least possible absolute values for x,y,z respectively is 6,10,15

from one... the square covers the signe of xyz and x,y,z are intigers ... insuff

from 2 still we have enough information about the signes of x,y,z except that sure that they are not +ve and may be all -ve or some +ve and some -ve

thus my answer is b
User avatar
B
yezz
Retired Moderator
Joined: 05 Jul 2006
Posts: 849
Own Kudos [?]: 1562 [0]
Given Kudos: 49
Send PM
GMAT ToolKit User
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   01 Sep 2006, 09:46
I guess i have to practise a lot more .. sorry folks i edited my answer
User avatar
rookie06
Manager
Manager
Joined: 26 Aug 2006
Posts: 59
Own Kudos [?]: 1 [0]
Given Kudos: 0
Location: BeanTown
Send PM
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   01 Sep 2006, 10:48
Statement 1: x,y,z could be -6, -5, -15 or 6, 5, 15 - INSUFF

Statement 2: x,y,z could be -6,-5,-15 or 2/5,2/3,1 - INSUFF

Together: x,y,z could be -6, -5, -15 or 6, 5, 15 - INSUFF

Answer E
User avatar
B
yezz
Retired Moderator
Joined: 05 Jul 2006
Posts: 849
Own Kudos [?]: 1562 [0]
Given Kudos: 49
Send PM
GMAT ToolKit User
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   01 Sep 2006, 10:58
i believe that as long as you have a common set of answers from one and two ie(-6,-5,-15) thus c is the answer
User avatar
B
yezz
Retired Moderator
Joined: 05 Jul 2006
Posts: 849
Own Kudos [?]: 1562 [0]
Given Kudos: 49
Send PM
GMAT ToolKit User
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   01 Sep 2006, 13:15
Kevin am i at least close to the truth or i should sleep on the idea of GMAT for a while :lol:
User avatar
B
kevincan
GMAT Instructor
Joined: 04 Jul 2006
Posts: 960
Own Kudos [?]: 693 [0]
Given Kudos: 6
Location: Madrid
 Q51  V50
Send PM
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   01 Sep 2006, 13:51
yezz wrote:
Well i will try to do my best on this one ... am still learning from you guys.specially both of you guys kevin and dahiya.

From the question stem x,y,z are all either +ve or -ve ( intigers or fractions)


from one... the square covers the signe of xyz and x,y,z are intigers and
... insuff
from 2 we do not have enough information about the signes of x,y,z
( specially that they could be fractions

Taking one and two ( from one) x,y,z are intigers and from question stem ..the least possible absolute values for x,y,z respectively is 6,10,15

thus sure that they are not all +ve Thus and putting into consideration the question stem they are all -ve... suff
thus my answer is c


Don't see why x ,y,and z must be integers!
User avatar
B
yezz
Retired Moderator
Joined: 05 Jul 2006
Posts: 849
Own Kudos [?]: 1562 [0]
Given Kudos: 49
Send PM
GMAT ToolKit User
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   Updated on: 02 Sep 2006, 06:38
Well I think that because (xyz)^2 is intiger therfore x,y,z are either intigers or a mix between intigers and complex numbers ( 7/2 and fractions ie : or their product might be 1 or a square root of an intiger ).... to keep the proportion of 5:3:2........

:roll:

Originally posted by yezz on 02 Sep 2006, 00:56.
Last edited by yezz on 02 Sep 2006, 06:38, edited 1 time in total.
User avatar
B
GMATT73
CEO
CEO
Joined: 29 Jan 2005
Posts: 2887
Own Kudos [?]: 1117 [0]
Given Kudos: 0
Send PM
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   Updated on: 02 Sep 2006, 06:58
kevincan wrote:
If 5x=3y=2z, is xyz>0?

(1) (xyz)^2 is an integer

(2) 2x+3y+z< 50


Kevin, are there no fractional values that meet the conditions above and yield an integer when squared. Intuitively, I think (C) might be possible.

Originally posted by GMATT73 on 02 Sep 2006, 06:17.
Last edited by GMATT73 on 02 Sep 2006, 06:58, edited 1 time in total.
User avatar
B
kevincan
GMAT Instructor
Joined: 04 Jul 2006
Posts: 960
Own Kudos [?]: 693 [0]
Given Kudos: 6
Location: Madrid
 Q51  V50
Send PM
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink] New post   02 Sep 2006, 06:51
[quote="kevincan"]If 5x=3y=2z, is xyz>0?

(1) (xyz)^2 is an integer

(2) 2x+3y+z0. Thus y and z would be positive and xyz would be positive, too. NOT SUFF

(2) 2x+5x+5x/2=19x/2 x<100/19 NOT SUFF

(1) and (2) Both possibilities for x cited in (1) satisfy (2) NOT SUFF


Answer: E



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: If 5x=3y=2z, is xyz>0? (1) (xyz)^2 is an integer (2) [#permalink]
02 Sep 2006, 06:51
Moderators:
Bunuel
Math Expert
92977 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts
GMATBusters
GMAT Tutor
1905 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions