If the tens digit of positive integer x is 5 and the tens digit of positive integer y is 5, how many possible values of the tens digit of 2(x+y) can there be?	Choose the correct choice:
A) 2	B) 3	C) 4	D) 5	E) 6
We only need to consider the tens and ones digits of x and y, and the last two digits can be represented as 50 + p and 50 + q respectively.   2(50+p+50+q)= 200 + 2(p + q)   2(p+q) can range from 0 up to a maximum value of 36 when p=q=9.   Then the tens and ones digits of 2(x+y) can range from 00 up to 36.   There can be 4 possibilities for the tens digit.   The answer is 4.
<result>C</result>
If the tens digit of positive integer x is 5 and the tens digit of positive integer y is 5, how many possible values of the tens digit of 2(x+y) can there be?