A cone and a cylinder have the same base and height, and the volume of the cone is 18 cubic decimeters smaller than that of the cylinder. What is the volume of the cone?
一个圆锥和一个圆柱等底等高，圆锥体积比圆柱小18立方分米，圆锥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>