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It is: 75
It is: (63+57)/2 = 60
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.
Well 63 divided by 3 equals 21. So 3 times 21 equals 63. 21 is that number.