$$12\frac{3}{4}+5\frac{2}{5}$$
$\frac{363}{20}=18.15$
$$\frac{48+3}{4}+\frac{5\times 5+2}{5}$$
$$\frac{51}{4}+\frac{5\times 5+2}{5}$$
$$\frac{51}{4}+\frac{25+2}{5}$$
$$\frac{51}{4}+\frac{27}{5}$$
$$\frac{255}{20}+\frac{108}{20}$$
$$\frac{255+108}{20}$$
$$\frac{363}{20}$$
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$\frac{3 \cdot 11 ^ {2}}{2 ^ {2} \cdot 5} = 18\frac{3}{20} = 18.15$
