32
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All the whole numbers that you can divide from 64 and get a whole number are 1, 2, 4, 8, 16, 32, and 64.
Average= Sum of numbers divided by how many numbers there are. So, Sum of numbers = 9+23+32=64 Average = 64/3=21.33
8
It is 4 because it's the highest common factor of both numbers
64 divided by 4 is 16.