A cylinder with a base area of 20 square meters and a height of 3 meters is cut into the largest cone, how many cubic meters are cut.
把一个底面积是20平方米，高3米的圆柱体削成最大的圆锥体，削去多少立方米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">20 * 3 * (2/3)</gadget>
<output>40</output>

<result>40</result>