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Wiki User
The halfway number is (15 + 129) /2 = 144/2 = 72
10 is the number halfway between -5 and 15.It is: 5
Halfway between 10 and 15 is (10 + 15) ÷ 2 = 121/2
15
57
26
13
It is: 15
2626 is.
12