$$8\frac{3}{8}+10\frac{1}{3}$$
$\frac{449}{24}\approx 18.708333333$
$$\frac{64+3}{8}+\frac{10\times 3+1}{3}$$
$$\frac{67}{8}+\frac{10\times 3+1}{3}$$
$$\frac{67}{8}+\frac{30+1}{3}$$
$$\frac{67}{8}+\frac{31}{3}$$
$$\frac{201}{24}+\frac{248}{24}$$
$$\frac{201+248}{24}$$
$$\frac{449}{24}$$
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$\frac{449}{2 ^ {3} \cdot 3} = 18\frac{17}{24} = 18.708333333333332$
