If the tens digit of positive integers x, y are 6, how many values of the tens digit of 2(x+y) can be there? Select the correct option:  A) 2  B) 3  C) 4  D) 5  E) 6
If X=y=60, 2(x+y)=240 is derived. If x=y=69, 2(x+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 x, y are 6, how many values of the tens digit of 2(x+y) can be there?