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If n is an integer, is n/15 an integer? (1) 3n/15 is an

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If n is an integer, is n/15 an integer? (1) 3n/15 is an [#permalink]

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New post 28 Jul 2009, 01:15
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If n is an integer, is n/15 an integer?
(1) 3n/15 is an integer.
(2) 8n/15 is an integer.

Please explain .. !

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Re: DS Que.. [#permalink]

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New post 28 Jul 2009, 02:19
for n/15 to be an integer, 3 and 5 must be factors of n.

statment 1) 3n/15 = 23 / (3*5) = n/5 integer. it means that 5 is a factor of n. insufficient

2) 8n/ (3*5) integer, since neither 3 nor 5 are factor of 8, they must be factors of n.

so IMO 2) alone is sufficient

B

OA please.

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Re: DS Que.. [#permalink]

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New post 28 Jul 2009, 05:52
[quote="nitishmahajan"]If n is an integer, is n/15 an integer?
(1) 3n/15 is an integer.
(2) 8n/15 is an integer.

does n has 3,5 as factors??

from one

n = 5x........insuff

from 2

n = 15x......suff

B

Kudos [?]: 449 [0], given: 49

Re: DS Que..   [#permalink] 28 Jul 2009, 05:52
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If n is an integer, is n/15 an integer? (1) 3n/15 is an

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