$$\frac{5}{8}\times(\frac{3}{5}+\frac{1}{4})$$
$\frac{17}{32}=0.53125$
$$\frac{5}{8}\left(\frac{12}{20}+\frac{5}{20}\right)$$
$$\frac{5}{8}\times \frac{12+5}{20}$$
$$\frac{5}{8}\times \frac{17}{20}$$
$$\frac{5\times 17}{8\times 20}$$
$$\frac{85}{160}$$
$$\frac{17}{32}$$
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$\frac{17}{2 ^ {5}} = 0.53125$