If y ≠ 3 and 3x/y is a prime integer greater than 2, : Quant Question Archive [LOCKED]
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

It is currently 09 Dec 2016, 00:48
GMAT Club Tests

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If y ≠ 3 and 3x/y is a prime integer greater than 2,

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
VP
VP
User avatar
Joined: 09 Jul 2007
Posts: 1104
Location: London
Followers: 6

Kudos [?]: 101 [0], given: 0

If y ≠ 3 and 3x/y is a prime integer greater than 2, [#permalink]

Show Tags

New post 22 Aug 2007, 15:32
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If y ≠ 3 and 3x/y is a prime integer greater than 2, which of the following must be true?
Ⅰ. x = y
Ⅱ. y = 1
Ⅲ. x and y are prime integers.
VP
VP
avatar
Joined: 10 Jun 2007
Posts: 1459
Followers: 7

Kudos [?]: 251 [0], given: 0

Re: prime intgr [#permalink]

Show Tags

New post 22 Aug 2007, 19:44
Ravshonbek wrote:
If y ≠ 3 and 3x/y is a prime integer greater than 2, which of the following must be true?
Ⅰ. x = y
Ⅱ. y = 1
Ⅲ. x and y are prime integers.


None.

3x/y = prime
x/y = prime/3
y and x doesn't need to equal.
Director
Director
User avatar
Joined: 03 May 2007
Posts: 886
Schools: University of Chicago, Wharton School
Followers: 6

Kudos [?]: 188 [0], given: 7

Re: prime intgr [#permalink]

Show Tags

New post 22 Aug 2007, 19:54
bkk145 wrote:
Ravshonbek wrote:
If y ≠ 3 and 3x/y is a prime integer greater than 2, which of the following must be true?
Ⅰ. x = y
Ⅱ. y = 1
Ⅲ. x and y are prime integers.


None.

3x/y = prime
x/y = prime/3
y and x doesn't need to equal.


i guessed x and y as intger but not that is not necessary.

if x = 10/3 and y = 2, 3x/y = 5.

we can change the value to get the prime integer value for 3x/y.
Manager
Manager
User avatar
Joined: 18 Jun 2007
Posts: 88
Followers: 2

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

 [#permalink]

Show Tags

New post 22 Aug 2007, 20:10
1 it is :)
Manager
Manager
avatar
Joined: 03 Sep 2006
Posts: 233
Followers: 1

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

 [#permalink]

Show Tags

New post 23 Aug 2007, 00:45
I'm confused. I also got Ans. 1)
What is the OA?
Senior Manager
Senior Manager
User avatar
Joined: 03 Jun 2007
Posts: 384
Followers: 3

Kudos [?]: 13 [0], given: 0

 [#permalink]

Show Tags

New post 23 Aug 2007, 08:37
Actually 1 and 2 can be true if x and y are not assumed as intergers. Y can be 1 and x can 17/3
Director
Director
User avatar
Joined: 31 Mar 2007
Posts: 585
Location: Canada eh
Followers: 9

Kudos [?]: 64 [0], given: 0

 [#permalink]

Show Tags

New post 23 Aug 2007, 10:36
3x/y

Obviously x=y

y!=3, so y has to divide x evenly since its an integer. but then x/y is an integer, and if so, then by definition 3x/y is not a prime. hence x/y == 1, as 3 is prime. so x=y.
VP
VP
User avatar
Joined: 09 Jul 2007
Posts: 1104
Location: London
Followers: 6

Kudos [?]: 101 [0], given: 0

Re: prime intgr [#permalink]

Show Tags

New post 23 Aug 2007, 10:40
bkk145 wrote:
Ravshonbek wrote:
If y ≠ 3 and 3x/y is a prime integer greater than 2, which of the following must be true?
Ⅰ. x = y
Ⅱ. y = 1
Ⅲ. x and y are prime integers.


None.

3x/y = prime
x/y = prime/3
y and x doesn't need to equal.


Can u explain it indetals plz
Senior Manager
Senior Manager
avatar
Joined: 28 Jun 2007
Posts: 319
Followers: 1

Kudos [?]: 36 [0], given: 0

Re: prime intgr [#permalink]

Show Tags

New post 23 Aug 2007, 11:08
Ravshonbek wrote:
If y ≠ 3 and 3x/y is a prime integer greater than 2, which of the following must be true?
Ⅰ. x = y
Ⅱ. y = 1
Ⅲ. x and y are prime integers.


My answer is none

I think most people here are assuming that x and y are integers. This is not a given.

1> x = y

Lets use some susbtitution:

If 3x/y = 3 then x = y [x=4, y=4]
If 3x/y = 5 then x = 5/3y [x=5/3, y=1]

This shows that x = y is not necessarily true.

2> y = 1

This will mean 3x/y = 3x. 3x cannot be a prime number. Hence this is not true either.

3> x and y prime

If 3x/y is prime and greater than 2 then it is not necessary for x and y to be prime. Try a few numbers:

x = 5/3, y = 1
x = 14/3, y = 2
Director
Director
User avatar
Joined: 31 Mar 2007
Posts: 585
Location: Canada eh
Followers: 9

Kudos [?]: 64 [0], given: 0

 [#permalink]

Show Tags

New post 23 Aug 2007, 11:39
Ah reals

Ok, none then
  [#permalink] 23 Aug 2007, 11:39
Display posts from previous: Sort by

If y ≠ 3 and 3x/y is a prime integer greater than 2,

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| 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®.