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20k

by gmat740 » Tue Aug 11, 2009 11:11 am
OA-B
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by ssmiles08 » Tue Aug 11, 2009 12:28 pm
1) Examples we can choose here: 2 and 3.

if k = 2.

20*2 = 40 is divisible by 8 possible numbers. 2^3*5^1 = (4)(2) = 8.

if k = 3.

20*3 = 60

60 is divisible by 12 possible numbers. 2^2*3*5 = (3)(2)(2) = 12.

Insufficient.

2) k = 7

20*7 = 140

140 is divisible by 12 factors. 2^2*5*7 = (3)(2)(2) = 12. Sufficient.

IMO B.
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by georgeung » Tue Aug 11, 2009 1:23 pm
Good call, ssmiles08. I thought it was D until I read what you said about K being 2 or 3. I now am 100% behind ssmiles08's answer.

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by vikram_k51 » Wed Aug 12, 2009 12:12 pm
Has to be D.
Each statement alone is sufficient.

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by prindaroy » Wed Aug 12, 2009 12:17 pm
No the answer is B. Caveat for statement 1 is 2 or other odd prime