Answer
$\frac{81z}{40}$
Work Step by Step
$\frac{9z}{20}$$\div$$\frac{2}{9}$=
=$\frac{9z}{20}$$\times$$\frac{9}{2}$=$\frac{9z\times9}{20\times2}$=
=$\frac{81z}{40}$
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