Answer:
One-fifth part of juice \[=\frac{1}{5}\] On third part of juice \[=\frac{1}{3}\] So we will compare it by cross multiplication method:\[\frac{1}{5}\] \[\frac{1}{3}\] \[1\times 3\] \[1\times 5\] \[3\]\[<\]\[5\] That means, \[\frac{1}{3}>\frac{1}{5}\] So, sister gets more juice.
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