$$15 1 \frac { 1 } { 2 }$$
$\frac{45}{2}=22.5$
$$15\times \frac{2+1}{2}$$
$$15\times \frac{3}{2}$$
$$\frac{15\times 3}{2}$$
$$\frac{45}{2}$$
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$\frac{3 ^ {2} \cdot 5}{2} = 22\frac{1}{2} = 22.5$
