$$3\frac{2}{6}+2\frac{1}{4}$$
$\frac{67}{12}\approx 5.583333333$
$$\frac{18+2}{6}+\frac{2\times 4+1}{4}$$
$$\frac{20}{6}+\frac{2\times 4+1}{4}$$
$$\frac{10}{3}+\frac{2\times 4+1}{4}$$
$$\frac{10}{3}+\frac{8+1}{4}$$
$$\frac{10}{3}+\frac{9}{4}$$
$$\frac{40}{12}+\frac{27}{12}$$
$$\frac{40+27}{12}$$
$$\frac{67}{12}$$
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$\frac{67}{2 ^ {2} \cdot 3} = 5\frac{7}{12} = 5.583333333333333$