$$20\frac{1}{2}+\frac{18}{2}$$
$\frac{59}{2}=29.5$
$$\frac{40+1}{2}+\frac{18}{2}$$
$$\frac{41}{2}+\frac{18}{2}$$
$$\frac{41+18}{2}$$
$$\frac{59}{2}$$
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$\frac{59}{2} = 29\frac{1}{2} = 29.5$
