Answer
$\frac{1}{3}$
Work Step by Step
$\frac{5}{12}\div\frac{15}{12}=\frac{5}{12}\times\frac{12}{15}=\frac{5\times12}{12\times15}=\frac{/\!\!5\times/\!\!\!12}{/\!\!\!12\times3\times/\!\!5}=\frac{1}{3}$
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