33\frac{1}{3}\%=\frac{1}{3}
6-\frac{1}{3}*6=4-2=4
V=\frac{2\sqrt{6}h^3}{27}
V_1=\frac{2\sqrt{6}6^3}{27}=\frac{432\sqrt{6}}{27}
V_2=\frac{2\sqrt{6}4^3}{27}=\frac{128\sqrt{6}}{27}
\frac{432\sqrt{6}}{27}-\frac{128\sqrt{6}}{27}=\frac{304\sqrt{6}}{27}
\frac{\frac{304\sqrt{6}}{27}}{\frac{432\sqrt{6}}{27}}*100\%=\frac{304}{432}*100\%\approx70\%