0
Wiki User
65
50 is exactly halfway between 40 and 60.
60
(30+60)/2 = 45
59.5
40
10
The number halfway between 18 and 60 is (18 + 60)/2 = 39.
It is: 70
Everything except 1, 2, 5 and 10.
It is: 45
75
60(40+80)/2 = 60