(a+b+c)/3
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Yes. For example, the average of 5, 7, and 9 is 7.
The average of these three numbers is 12.
The average of these three numbers is 10.666
It average of 2 numbers is 9 then take 9 away from 12, so average of 3 numbers is now 9, with 3 'left over.' The 3 which is 'left over' divides among the three numbers by adding 1 to each of them, raising the new average to 10.
Add them together, divide that total by three