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

Rationale: 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 - > 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 c .
Answer: C