Answer
$y^{\frac{1}{6}}$
Work Step by Step
Using laws of exponents, then,
\begin{array}{l}
\dfrac{y^{1/3}}{y^{1/6}}
\\\\=
y^{\frac{1}{3}-\frac{1}{6}}
\\\\=
y^{\frac{2}{6}-\frac{1}{6}}
\\\\=
y^{\frac{1}{6}}
.\end{array}
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