$$3\frac{2}{4}+11\frac{1}{2}$$
$15$
$$\frac{12+2}{4}+\frac{11\times 2+1}{2}$$
$$\frac{14}{4}+\frac{11\times 2+1}{2}$$
$$\frac{7}{2}+\frac{11\times 2+1}{2}$$
$$\frac{7}{2}+\frac{22+1}{2}$$
$$\frac{7}{2}+\frac{23}{2}$$
$$\frac{7+23}{2}$$
$$\frac{30}{2}$$
$$15$$
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$3\times 5$
