5 and 7
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9 is the product of 3 * 3, or 3 squared.
There are two : 5 and 7.
3 units
The number 8 is halfway between 5 and 11. It is 3 more than 5 and 3 less than 11. To find a halfway point (which is also the average), add the numbers together and divide by 2.
(X/3) - 11 =10 X/3 = 21 X = 63