After cutting off 18 cubic decimeters from a cylinder, the largest cone is obtained. What is the volume of the cone?
把一个圆柱体削去18立方分米后，得到一个最大的圆锥体，圆锥体的体积是多少立方分米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<result>9</result>