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integer-DS

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capthan
 Post subject: integer-DS
 Post Posted: Thu Jun 12, 2008 3:42 pm 
If n is an integers, is n/15 an integer?

1) 3n/15 is an integer.

2)8n/15 is an integer
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parvezshah
 Post subject: Re: integer-DS
 Post Posted: Thu Jun 12, 2008 7:17 pm 
capthan wrote:
If n is an integers, is n/15 an integer?

1) 3n/15 is an integer.

2)8n/15 is an integer


B)
1) substituting n value in the first option we will get 5 , 10 ...
2) substituting n value we get n to b 90 and above

thus B is the answer
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success
 Post subject:
 Post Posted: Thu Jun 12, 2008 11:59 pm 
The way I see it is this

Rephrase the question: Does n's prime box have a '3 and a '5'.

1.) 3n/15 = n/5 Since this is an integer, we know that n is divisible by 5 . Therefore, n's prime box Includes a '5.' However, we do not know whether or not n is also divisible by 3, thus statement 1 is insufficient.

2.) 8n/15 = is also an integer, but if u look closely, you will see that 8 is not divisible by 15. Thus, for 8n/15 to be an integer, it must be that n is divisible by 15. Thus B is sufficient.

The answer is B.
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rfernandez
 Post subject:
 Post Posted: Fri Jun 13, 2008 4:22 am 
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Course Students


Posts: 386
Nice solution, success!
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