$$12 \frac { 1 } { 2 } \frac { 3 } { 2 }$$
$\frac{75}{4}=18.75$
$$\frac{24+1}{2}\times \frac{3}{2}$$
$$\frac{25}{2}\times \frac{3}{2}$$
$$\frac{25\times 3}{2\times 2}$$
$$\frac{75}{4}$$
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$\frac{3 \cdot 5 ^ {2}}{2 ^ {2}} = 18\frac{3}{4} = 18.75$
