A cylinder and a cone with the same base and height, the sum of their volumes is 36 cubic centimeters, what is the volume of the cone?
等底等高的一个圆柱和一个圆锥，它们的体积之和是36立方厘米，圆锥的体积是多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<result>9</result>