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

It is currently 27 Aug 2014, 17:05

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 n and y are positive integers and 450y = n^3, which is

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
User avatar
Joined: 06 Jul 2006
Posts: 295
Location: SFO Bay Area
Schools: Berkeley Haas
Followers: 2

Kudos [?]: 30 [0], given: 0

GMAT Tests User
If n and y are positive integers and 450y = n^3, which is [#permalink] New post 24 Feb 2008, 15:49
If n and y are positive integers and 450y = n^3, which is the following must be an integer ?

I. y / (3 * 2^2 * 5)
II. y / (3^2 * 2 * 5)
III. y / (3 * 2 * 5^2)

A. None
B. I only
C. II only
D. III only
E. I, II and III
Senior Manager
Senior Manager
avatar
Joined: 26 Jan 2008
Posts: 267
Followers: 2

Kudos [?]: 74 [0], given: 1

GMAT Tests User
Re: Maths: Value of y [#permalink] New post 24 Feb 2008, 16:14
suntaurian wrote:
If n and y are positive integers and 450y = n^3, which is the following must be an integer ?

I. y / (3 * 2^2 * 5)
II. y / (3^2 * 2 * 5)
III. y / (3 * 2 * 5^2)

A. None
B. I only
C. II only
D. III only
E. I, II and III


(B)

Since n^3 = 450y = 2 * (3^2) * (5^2) * y
=> y is atleast 60 (2*2*3*5) in order to make a perfect cube

Substituting y=60 in the three equations, only I gives an integer
_________________

My GMAT debrief

Senior Manager
Senior Manager
User avatar
Joined: 06 Jul 2006
Posts: 295
Location: SFO Bay Area
Schools: Berkeley Haas
Followers: 2

Kudos [?]: 30 [0], given: 0

GMAT Tests User
Re: Maths: Value of y [#permalink] New post 24 Feb 2008, 16:27
OA is B.

For some lame reason i kept writing 450 as 5*3*5*2*5 and had three 5s instead of two.
Re: Maths: Value of y   [#permalink] 24 Feb 2008, 16:27
    Similar topics Author Replies Last post
Similar
Topics:
If n and y are positive integers and 450y = n^3, which of uphillclimb 7 21 Oct 2006, 09:48
If y and n are positive integers and 450y = N^3 , which of MBAlad 6 15 Sep 2006, 16:02
If n and y are positive integers and 450y = n^3, which of x242222 7 21 May 2006, 13:02
If n and y are positive integers adn 450y=n^3 , which of the dinesh8 4 07 May 2006, 17:19
If n and y are positive integers and 450y=n^3, which of the jodeci 2 04 Apr 2006, 01:30
Display posts from previous: Sort by

If n and y are positive integers and 450y = n^3, which is

  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®.