$\triangle XYZ$ is right angled at Y. If $m\angle Z$ = $60^{0}$, what is the length of YZ (in cm), if ZX = $3\sqrt{3}$ cm?

$\triangle XYZ$ is right angled at Y. If $m\angle Z$ = $60^{0}$, what is the length of YZ (in cm), if ZX = $3\sqrt{3}$ cm?
1). $\frac{3\sqrt{3}}{2}$
2). $3\sqrt{3}$
3). 9
4). 6

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