It is currently 21 Sep 2017, 18:05

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

PS multiples

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
1 KUDOS received
Manager
Manager
avatar
Joined: 12 Oct 2008
Posts: 104

Kudos [?]: 9 [1], given: 0

PS multiples [#permalink]

Show Tags

New post 28 Dec 2008, 16:03
1
This post received
KUDOS
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (03:47) wrong based on 1 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If y is the smallest positive integer such that 3,150 multiplied by y is the square of an
integer, then y must be
A. 2
B. 5
C. 6
D. 7
E. 14

Kudos [?]: 9 [1], given: 0

VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1403

Kudos [?]: 423 [0], given: 1

Re: PS multiples [#permalink]

Show Tags

New post 28 Dec 2008, 16:07
Start with the last one to save time

3150 X 14 = 44100 = 441 X 100

If we apply the sqrt it is 21 X 10

Kudos [?]: 423 [0], given: 1

SVP
SVP
User avatar
Joined: 29 Aug 2007
Posts: 2473

Kudos [?]: 832 [0], given: 19

Re: PS multiples [#permalink]

Show Tags

New post 28 Dec 2008, 19:32
linau1982 wrote:
If y is the smallest positive integer such that 3,150 multiplied by y is the square of an
integer, then y must be

A. 2
B. 5
C. 6
D. 7
E. 14


3150 = 2x3x3x5x5x7
3 and 5 have pairs but not 2 and 7. so need 2x7 = 14
so, 3150x2x7 = 2x2x3x3x5x5x7x7 = (2x3x5x7)^2 = (210)^2

So it is D.
_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html


GT

Kudos [?]: 832 [0], given: 19

Manager
Manager
avatar
Joined: 27 May 2008
Posts: 199

Kudos [?]: 45 [0], given: 0

Re: PS multiples [#permalink]

Show Tags

New post 28 Dec 2008, 21:17
Clean approach GMAT TIGER +1 for you

Kudos [?]: 45 [0], given: 0

SVP
SVP
avatar
Joined: 28 Dec 2005
Posts: 1549

Kudos [?]: 173 [0], given: 2

Re: PS multiples [#permalink]

Show Tags

New post 30 Dec 2008, 12:23
I get the breaking into primes part, but as we see both 2 and 7 need an additional pair of 2's and 7's ... shouldnt the answer then be 14 and not 7 ?

Kudos [?]: 173 [0], given: 2

Re: PS multiples   [#permalink] 30 Dec 2008, 12:23
Display posts from previous: Sort by

PS multiples

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| 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®.