$$15 \frac { 3 } { 4 } + 12 \frac { 1 } { 2 }$$
$\frac{113}{4}=28.25$
$$\frac{60+3}{4}+\frac{12\times 2+1}{2}$$
$$\frac{63}{4}+\frac{12\times 2+1}{2}$$
$$\frac{63}{4}+\frac{24+1}{2}$$
$$\frac{63}{4}+\frac{25}{2}$$
$$\frac{63}{4}+\frac{50}{4}$$
$$\frac{63+50}{4}$$
$$\frac{113}{4}$$
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$\frac{113}{2 ^ {2}} = 28\frac{1}{4} = 28.25$
