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by gmatblood » Fri Nov 04, 2011 9:14 am
Is n divisible by 12?
1. n/6 is an integer.
2. n/4 is an integer.

[spoiler]from 1) N can be 6,12,18,24,30,36,42 ... (Insufficient)

from 2) N can be 4,8,12,16,20,24 ... (Insufficient)

From 1 and 2, N can be 12,24, ... (Sufficient)[/spoiler]
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Source: — Data Sufficiency |
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by HSPA » Fri Nov 04, 2011 9:54 am
yup you solved it correct : LCM problem
First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.
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by Tani » Fri Nov 04, 2011 10:05 am
To be divisible by 12, n must be divisible by 2 twice plus 3.

1) To be divisible by 6, n must be divisible by 2 and 3. - doesn't tell us that we can divide by 2 twice
2) to be divisible by 4, n must be divisible by 2 twice - doesn't tell us that n is divisible by three

combining, n must be divisible by two twice plus a 3, therefore it must be divisible by twelve
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