If J and X are integers, and 10J + X is odd, which of the following must be true?  Pick one
A) J is odd  B) J is even  C) X is odd  D) X is even  E) both J and X are odd
10J will be always even as 10 has 2 as one of its factors   if 10J+X is odd, then the only possible explanation is that X is odd   correct answer X is odd
<result>C</result>
If J and X are integers, and 10J + X is odd, which of the following must be true?