Problem: 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 ?
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 .
annotated_formula: subtract(6, 2)