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Ashetty: Senior | Next Rank: 100 Posts; Posts: 49; Joined: Sun May 08, 2011 4:33 pm

by Ashetty » Wed Sep 07, 2011 6:10 am

What is the greatest value of a positive integer n such that 3n is a factor of 1815?

15
18
30
33
45

Ans : C

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Source: Beat The GMAT — Problem Solving | Wed Sep 07, 2011 6:10 am

kmittal82: Master | Next Rank: 500 Posts; Posts: 324; Joined: Mon Jul 05, 2010 6:44 amFollowed by: 3 members; Location: London; Thanked: 70 times

by kmittal82 » Wed Sep 07, 2011 6:18 am

But 90 (assuming n = 30 as given by the answer) isn't a factor of 1815
Infact, none of the numbers mentioned in the list, when multiplied by 3, are factors of 1815.

... unless I have grossly misundertsood the question

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Wed Sep 07, 2011 7:02 am

Ashetty wrote:What is the greatest value of a positive integer n such that 3n is a factor of 1815?

15
18
30
33
45

Ans : C

1815 is the greatest possible factor of 1815
Since (3)(605)=1815, we can see that if n=605 then 3n will be a factor of 1815

So, the answer must be [spoiler]605 (which does not appear as an answer choice)[/spoiler]

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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Ashetty: Senior | Next Rank: 100 Posts; Posts: 49; Joined: Sun May 08, 2011 4:33 pm

by Ashetty » Wed Sep 07, 2011 7:06 am

Question number 20.So we shouldn't believe this website than?..
https://www.bestsamplequestions.com/gmat ... ons-1.html

Thanks!

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Wed Sep 07, 2011 7:17 am

Ashetty wrote:Question number 20.So we shouldn't believe this website than?..
https://www.bestsamplequestions.com/gmat ... ons-1.html

Thanks!

Since I haven't looked into all of its questions, I wouldn't go as far as denouncing the entire website

, but I can tell you that question #20 has some problems.

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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navami: Legendary Member; Posts: 540; Joined: Sat Dec 20, 2008 7:24 pmFollowed by: 6 members; Thanked: 37 times

by navami » Thu Sep 08, 2011 4:49 am

Yes 605 is the rite answer here considering 1815 is the largest factor of 1815.
if we have to find the value of N and largest factor is not equal to 1815 then the ans will be 121.

This time no looking back!!!
Navami

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