$$\frac{24}{40}\times\frac{21}{40}$$
$\frac{63}{200}=0.315$
$$\frac{3}{5}\times \frac{21}{40}$$
$$\frac{3\times 21}{5\times 40}$$
$$\frac{63}{200}$$
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$\frac{3 ^ {2} \cdot 7}{2 ^ {3} \cdot 5 ^ {2}} = 0.315$