In N is a positive integer less than 200, and 18N/60 is an integer, then N has how many different positive prime factors? Answers:
A) 2
B) 3
C) 5
D) 6
E) 8
(A).   18n/60 must be an integer. =&gt; 3n/10 must be an integer. Hence n must be a multiple of 2*5.   =&gt; n has 2 different prime integers .
<result>A</result>
In N is a positive integer less than 200, and 18N/60 is an integer, then N has how many different positive prime factors?