$$12 \frac { 3 } { 8 } + 8 \frac { 1 } { 6 }$$
$\frac{493}{24}\approx 20.541666667$
$$\frac{96+3}{8}+\frac{8\times 6+1}{6}$$
$$\frac{99}{8}+\frac{8\times 6+1}{6}$$
$$\frac{99}{8}+\frac{48+1}{6}$$
$$\frac{99}{8}+\frac{49}{6}$$
$$\frac{297}{24}+\frac{196}{24}$$
$$\frac{297+196}{24}$$
$$\frac{493}{24}$$
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$\frac{17 \cdot 29}{2 ^ {3} \cdot 3} = 20\frac{13}{24} = 20.541666666666668$
