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

 It is currently 05 Jul 2015, 23:59

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If n and y are positive integers

Author Message
TAGS:
Manager
Joined: 05 Aug 2008
Posts: 91
Schools: McCombs Class of 2012
Followers: 1

Kudos [?]: 24 [0], given: 0

If n and y are positive integers [#permalink]  03 Jan 2009, 21:32
Attachment:

Q1.JPG [ 17.6 KiB | Viewed 1057 times ]
Intern
Joined: 26 May 2008
Posts: 8
Location: Chicago, IL
Followers: 0

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

Re: Integers [#permalink]  03 Jan 2009, 22:02
450y = n^3
or (2* 3^2 * 5^2) * (3 * 5 * 2^2) = n^3

So the smallest value of y can be 60 which is satisfied by I. So answer is B.
SVP
Joined: 29 Aug 2007
Posts: 2493
Followers: 59

Kudos [?]: 577 [0], given: 19

Re: Integers [#permalink]  03 Jan 2009, 22:50
agree with B. I.
450y = n^3
(2* 3^2 * 5^2) y = n^3
y has to be at least (2^2) (3) (5) to have 450y = n^3.
_________________
Manager
Joined: 05 Aug 2008
Posts: 91
Schools: McCombs Class of 2012
Followers: 1

Kudos [?]: 24 [0], given: 0

Re: Integers [#permalink]  03 Jan 2009, 23:13
That's what I had thought, but that is not the correct answer.
SVP
Joined: 29 Aug 2007
Posts: 2493
Followers: 59

Kudos [?]: 577 [0], given: 19

Re: Integers [#permalink]  04 Jan 2009, 12:43
smarinov wrote:
That's what I had thought, but that is not the correct answer.

I donot think there is anything other than what is discussed above.

B should be it..
_________________
Manager
Joined: 05 Aug 2008
Posts: 91
Schools: McCombs Class of 2012
Followers: 1

Kudos [?]: 24 [0], given: 0

Re: Integers [#permalink]  04 Jan 2009, 13:36
According to the GMATprep it is E.
SVP
Joined: 29 Aug 2007
Posts: 2493
Followers: 59

Kudos [?]: 577 [0], given: 19

Re: Integers [#permalink]  04 Jan 2009, 14:30
smarinov wrote:
According to the GMATprep it is E.

Uncover the OE as well.
_________________
Senior Manager
Joined: 23 May 2008
Posts: 428
Followers: 4

Kudos [?]: 145 [0], given: 14

Re: Integers [#permalink]  05 Jan 2009, 03:20
i am pretty sure there is something wrong with the GMAT prep software....
the answer has to be B
Intern
Joined: 03 Jan 2009
Posts: 2
Schools: u of chicago
Followers: 0

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

Re: Integers [#permalink]  05 Jan 2009, 07:27
II: (n^3/(5 x5 x 3 x 3 x 2))/(5 x 3 x 3 x 2) => ((n^3)(5 x 3 x 3 x 2))/(5 x5 x 3 x 3 x 2) => (n^3)/5 if n = 3 then 9/5, which isn't an integer. similar results for I and III: none of them cancels completely out, right? unless there's a typo in the question stem or something. ???
Intern
Joined: 05 Jan 2009
Posts: 7
Followers: 0

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

Re: Integers [#permalink]  06 Jan 2009, 16:05
Correct me if I'm wrong. I think we are forgetting that the question is not asking for the smallest integer.

the smallest value of y would be 5 x 3 x 2^2 in order for 450y = n^3 to be true

but, y could also be 5^4 x 3^4 x 2^5 and that would still make choices I, II and II into integers

Hope that's correct.
SVP
Joined: 05 Jul 2006
Posts: 1516
Followers: 5

Kudos [?]: 127 [0], given: 39

Re: Integers [#permalink]  06 Jan 2009, 21:18
B is right and OE is wrong
SVP
Joined: 29 Aug 2007
Posts: 2493
Followers: 59

Kudos [?]: 577 [0], given: 19

Re: Integers [#permalink]  06 Jan 2009, 21:45
ic3ncok3 wrote:
Correct me if I'm wrong. I think we are forgetting that the question is not asking for the smallest integer.

the smallest value of y would be 5 x 3 x 2^2 in order for 450y = n^3 to be true

but, y could also be 5^4 x 3^4 x 2^5 and that would still make choices I, II and II into integers

Hope that's correct.

Must implies that "at any case or worst case scenerios". Those (y's value other than 2^2*3*5) are not the worst case scenerios.
Aaccording to the question: y must be at least 60 (or 2^2*3*5). if y is none othe r than 60, II and III cannot be an integer.

So none other B is an OA. Hope everybody agrees.
_________________
Re: Integers   [#permalink] 06 Jan 2009, 21:45
Similar topics Replies Last post
Similar
Topics:
If n and y are positive integers and 450y = (n^3), which of 10 10 Dec 2007, 21:34
If n and y are positive integers and 450y = n^3, which of 7 21 Oct 2006, 09:48
If y and n are positive integers and 450y = N^3 , which of 6 15 Sep 2006, 16:02
If n and y are positive integers and 450y = n^3, which of 7 21 May 2006, 13:02
If n and y are positive integers and 450y=n^3, which of the 2 04 Apr 2006, 01:30
Display posts from previous: Sort by