There are an infinite number of them. The smallest one
is 63, and the rest are all the multiples of 63.
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3
9/21 = 0.4286 so 43% of 21 = 9.03 = 9 rounded to whole number.
The number 63 can be evenly divided by 1, 3, 7, 9, 21, and 63.
The smallest number that both 21 and 23 can go into is 483.
9