$$3\frac{3}{4}+5\frac{1}{2}+3\frac{1}{4}$$
$\frac{25}{2}=12.5$
$$\frac{12+3}{4}+\frac{5\times 2+1}{2}+\frac{3\times 4+1}{4}$$
$$\frac{15}{4}+\frac{5\times 2+1}{2}+\frac{3\times 4+1}{4}$$
$$\frac{15}{4}+\frac{10+1}{2}+\frac{3\times 4+1}{4}$$
$$\frac{15}{4}+\frac{11}{2}+\frac{3\times 4+1}{4}$$
$$\frac{15}{4}+\frac{22}{4}+\frac{3\times 4+1}{4}$$
$$\frac{15+22}{4}+\frac{3\times 4+1}{4}$$
$$\frac{37}{4}+\frac{3\times 4+1}{4}$$
$$\frac{37}{4}+\frac{12+1}{4}$$
$$\frac{37}{4}+\frac{13}{4}$$
$$\frac{37+13}{4}$$
$$\frac{50}{4}$$
$$\frac{25}{2}$$
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$\frac{5 ^ {2}}{2} = 12\frac{1}{2} = 12.5$
