You have to assign some variable name to "a number", for example, "n". The difference would be:
20 - n
Half this difference is:
(1/2) (20 - n)
Or alternately:
(20 - n) / 2
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[Number of players]/2
32 - n/2
The algebraic expression for "8 more than half a number" can be represented as ( \frac{x}{2} + 8 ), where ( x ) represents the unknown number. This expression first calculates half of the number by dividing it by 2, then adds 8 to the result.
8x2
14/2