If 148/x is an integer and 108/x is an integer, which of the following must be true?
I. 9/x is an integer
II. 12/x is an integer
III. 36/x is an integer  Choices:
A) I only B) III only C) I and II only D) II and III only E) I, II and III
I think, here we should use the greatest common factor.   The greatest common factor for 148 and 108 is 36.   So 36/x is an integer.   For the rest of the answers, if x is 36 then 9/x and 12/x leads to fractions.   Ans is I and II only.
<result>C</result>
If 148/x is an integer and 108/x is an integer, which of the following must be true?
I. 9/x is an integer
II. 12/x is an integer
III. 36/x is an integer