$$3 \frac { 1 } { 10 } \times 24$$
$\frac{372}{5}=74.4$
$$\frac{30+1}{10}\times 24$$
$$\frac{31}{10}\times 24$$
$$\frac{31\times 24}{10}$$
$$\frac{744}{10}$$
$$\frac{372}{5}$$
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$\frac{2 ^ {2} \cdot 3 \cdot 31}{5} = 74\frac{2}{5} = 74.4$
