If the tens digit of positive integers m, y are 6, how many values of the tens digit of 2(m+y) can be there? Choose the correct option.
A) 2 B) 3 C) 4 D) 5 E) 6
If the tens digit of positive integers m, y are 6, how many values of the tens digit of 2(m+y) can be there?   A. 2   B. 3   C. 4   D. 5   E. 6   -&gt; If m=y=60, 2(m+y)=240 is derived. If m=y=69, 2(m+y)=276 is derived, which makes 4,5,6,7 possible for the tens digit. Therefore, the answer is 4.
<result>C</result>
If the tens digit of positive integers m, y are 6, how many values of the tens digit of 2(m+y) can be there?