$$10\frac{1}{6}+8\frac{5}{36}$$
$\frac{659}{36}\approx 18.305555556$
$$\frac{60+1}{6}+\frac{8\times 36+5}{36}$$
$$\frac{61}{6}+\frac{8\times 36+5}{36}$$
$$\frac{61}{6}+\frac{288+5}{36}$$
$$\frac{61}{6}+\frac{293}{36}$$
$$\frac{366}{36}+\frac{293}{36}$$
$$\frac{366+293}{36}$$
$$\frac{659}{36}$$
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$\frac{659}{2 ^ {2} \cdot 3 ^ {2}} = 18\frac{11}{36} = 18.305555555555557$