A cylinder and a cone with the same base and height, the sum of their volumes is 80 cubic centimeters, what is the volume of the cone in cubic centimeters?
等底等高的一个圆柱和一个圆锥，它们的体积和是80立方厘米，则圆锥的体积是多少立方厘米．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<result>20</result>