Answer
$\frac{1}{5}$
Work Step by Step
$\frac{8}{40} = \frac{2 * 2 * 2}{2 * 2 * 2 * 5} = \frac{1}{5} * \frac{2 * 2 * 2}{2 * 2 * 2} = \frac{1}{5}$
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