Oh, dude, halfway between 17 and 63? That's like asking me to pick a favorite child - impossible! But, if you really want to know, it's 40. I mean, I could go into the whole math explanation, but let's be real, who really cares about that stuff anyway?
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It is: 75
It is: (63+57)/2 = 60
42
Do you mean like what is the number exactly between them. 53+63=116/2=58
There are lots of numbers between 63 and 720. Exactly halfway between them is 391.50, so that may be the answer you are looking for.