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If 6 is not a factor of d, is 12d divisible by 6?

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Manager
Joined: 12 Nov 2011
Posts: 130

Kudos [?]: 33 [0], given: 24

If 6 is not a factor of d, is 12d divisible by 6? [#permalink]

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02 Aug 2012, 13:05
If 6 is not a factor of d, is 12d divisible by 6?

The answer is YES. But if d=0.1, than 12d=1.2 and it is not divisible by 6. Any thoughts?

Kudos [?]: 33 [0], given: 24

Math Expert
Joined: 02 Sep 2009
Posts: 41891

Kudos [?]: 128910 [1], given: 12183

Re: If 6 is not a factor of d, is 12d divisible by 6? [#permalink]

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02 Aug 2012, 13:27
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Expert's post
Runner2 wrote:
If 6 is not a factor of d, is 12d divisible by 6?

The answer is YES. But if d=0.1, than 12d=1.2 and it is not divisible by 6. Any thoughts?

You are right if we were not told that d is an integer then 12d may or may not be divisible by 6, consider d=1 and d=1/3. Though MGMAT states on that page that "all variables in problems #1 through #11 are assumed to be integers unless otherwise indicated." Hence their answer YES is correct.

Also notice that every GMAT divisibility question will tell you in advance that any unknowns represent positive integers (ALL GMAT divisibility questions are limited to positive integers only).

Hope it's clear.
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Kudos [?]: 128910 [1], given: 12183

Re: If 6 is not a factor of d, is 12d divisible by 6?   [#permalink] 02 Aug 2012, 13:27
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