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Divisibility

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Divisibility

by jose.mario.amaya » Tue Sep 10, 2013 12:48 pm
Is N*M/8 ?
1) N is divisible by 5
2) N*M is divisible by 40


B
Last edited by jose.mario.amaya on Wed Sep 11, 2013 6:20 am, edited 3 times in total.
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by Jim@StratusPrep » Tue Sep 10, 2013 2:27 pm
Statement 2 is not really a statement. Throw this question out.
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by TheGmatTutor » Tue Sep 10, 2013 6:45 pm
In statement 2 I think he's trying to say that N*M is divisible by 40. If that's right, here's my interpretation:

1) Only proves N has 5 as a factor, insufficient
2) Proves N*M has 40 as a factor, therefore it has 3 2's and a 5. If it has 3 2's, then it must be divisible by 8, so sufficient

Answer: B
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