A cylinder and a cone have the same base and height, and the sum of their volumes is 60 cubic centimeters. What is the volume of the cone?
一个圆柱和一个圆锥等底等高，它们体积总和是60立方厘米，圆锥体积是多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>