$$10 \frac { 1 } { 8 } + 10 \frac { 1 } { 18 }$$
$\frac{1453}{72}\approx 20.180555556$
$$\frac{80+1}{8}+\frac{10\times 18+1}{18}$$
$$\frac{81}{8}+\frac{10\times 18+1}{18}$$
$$\frac{81}{8}+\frac{180+1}{18}$$
$$\frac{81}{8}+\frac{181}{18}$$
$$\frac{729}{72}+\frac{724}{72}$$
$$\frac{729+724}{72}$$
$$\frac{1453}{72}$$
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$\frac{1453}{2 ^ {3} \cdot 3 ^ {2}} = 20\frac{13}{72} = 20.180555555555557$
