$$\frac{42}{1}\times\frac{13}{28}$$
$\frac{39}{2}=19.5$
$$42\times \frac{13}{28}$$
$$\frac{42\times 13}{28}$$
$$\frac{546}{28}$$
$$\frac{39}{2}$$
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$\frac{3 \cdot 13}{2} = 19\frac{1}{2} = 19.5$
