![x = \sqrt[3]{\frac{yh {}^{2} }{20} } = \sqrt[3]{\frac{67.5h \times h {}^{2} }{20} } = \frac{3h}{2}](/tpl/images/0838/9992/c3685.png)
![y \: \alpha \: x {}^{3} \\ y = kx^{3} \\ k = \frac{y}{x {}^{3} } =\frac{20h}{x {}^{3} } = \frac{20h}{h {}^{3} } = \frac{20}{h {}^{2} } \\ \\ when \: y \: = 67.5h \: then \\ x = \sqrt[3]{ \frac{k}{y} } = \frac{3h}{2}](/tpl/images/0838/9992/40a3b.png)
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