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is n/15 an integer?

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Source: — Data Sufficiency |
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by ajith » Fri Feb 19, 2010 4:20 am
daretodream wrote:If n is an integer, is n/15 an integer?
(1) 3n/15 is an integer.
(2) 8n/15 is an integer.
1)insufficient [ n = 5 , and n =15 satisfies both but 5/15 is not an integer]
2) Sufficient [ n has to be a multiple of 15 in this case and hence n/15 will be an integer]

B
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by thephoenix » Fri Feb 19, 2010 4:25 am
daretodream wrote:If n is an integer, is n/15 an integer?
(1) 3n/15 is an integer.
(2) 8n/15 is an integer.
IMO B

s1) n/5 is an int ----->n can be 5,10,15
but n/15 is int depends on n and is not suff

s2) n can be only multiples of 15
hence n/15 is an int
suff
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by shashank.ism » Sun Feb 21, 2010 12:47 pm
daretodream wrote:If n is an integer, is n/15 an integer?
(1) 3n/15 is an integer.
(2) 8n/15 is an integer.
St.1) 3n/15 is an integer. as 15 = 3x5 so n/15 may or may not be an integer ============not suff.
St.2) 8n/15 is an integer. here 8 and 15 has no common factor so n/15 is surely an integer =======suff..
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