The answer is six.
The sum of 75 plus 5 is 80.
5
(-4) + (5) = 1 [positive one]
The sum is 5/18
The sum is 5/18
'Sum' is pretty much a synonym for add, and 5+5 or 5 plus 5 is 10.
The sum is 1 5/12
4 or 5-1
5+5=10, +5 = 15
5 + 5 + 5 ≠ 550
11
The sum is 1511.