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Number property need help

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Senior Manager
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Joined: 23 Mar 2011
Posts: 474
Location: India
GPA: 2.5
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Kudos [?]: 112 [0], given: 59

Number property need help [#permalink] New post 21 Oct 2011, 08:58
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A school administrator will assign each student in a group of n students to one of m classrooms.[highlight]If 3<m<13<n[/highlight], is it possible to assign each of n students to one of the m classrooms so that each classroom has the same number of students assigned to it?

1. It is possible to assign each of 3n students to one of m classrooms so that each classroom has the same number of students assigned to it.

2. It is possible to assign each of 13n students to one of m classrooms so that each classroom has the same number of students assigned to it.
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Senior Manager
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Re: Number property need help [#permalink] New post 21 Oct 2011, 09:33
Very nice question and answer is indeed "B". I picked "D" initially.

Explanation, The whole question boils down to --> n/m = integer or not. We know, 3<m<13.
1. Given, 3n/m= integer, it CAN NOT be refered that n/m is interger because 3<m<13.
Check this - if n=14 and m=6. This condition is invalid. Hence insuff.

2. Given, 13n/m= integer, it CAN be refered that n/m is interger because m<13 & m is PRIME number.
Hence suff.

Hence B is the answer.
Cheers.
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Senior Manager
Senior Manager
User avatar
Joined: 23 Mar 2011
Posts: 474
Location: India
GPA: 2.5
WE: Operations (Hospitality and Tourism)
Followers: 11

Kudos [?]: 112 [0], given: 59

Re: Number property need help [#permalink] New post 21 Oct 2011, 11:26
Ajay, request you to please elaborate. I cant get this correct mathematically....
_________________

"When the going gets tough, the tough gets going!"

Bring ON SOME KUDOS MATES+++



-----------------------------
Quant Notes consolidated: consolodited-quant-guides-of-forum-most-helpful-in-preps-151067.html#p1217652

My GMAT journey begins: my-gmat-journey-begins-122251.html

All about Richard Ivey: all-about-richard-ivey-148594.html#p1190518

Re: Number property need help   [#permalink] 21 Oct 2011, 11:26
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