The answer is 47 / 47.5. I calculated it by adding 45 and 50, then divided it by 2.
The answer is 45.
It is: (40+50)/2 = 45
50 is exactly halfway between 40 and 60.
50
It is: 50
75
41
137.5
35
It is 25.5 which is the number halfway between them.
50 - 24 = 26 / 2 = 13
65