$$10\frac{1}{8}+10\frac{1}{4}$$
$\frac{163}{8}=20.375$
$$\frac{80+1}{8}+\frac{10\times 4+1}{4}$$
$$\frac{81}{8}+\frac{10\times 4+1}{4}$$
$$\frac{81}{8}+\frac{40+1}{4}$$
$$\frac{81}{8}+\frac{41}{4}$$
$$\frac{81}{8}+\frac{82}{8}$$
$$\frac{81+82}{8}$$
$$\frac{163}{8}$$
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$\frac{163}{2 ^ {3}} = 20\frac{3}{8} = 20.375$
