A cone and a cylinder have the same base and height, and their volumes differ by 20 cubic centimeters, what is the volume of the cylinder?
一个圆锥和一个圆柱等底等高，它们的体积相差20立方厘米，那么圆柱的体积是多少．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<result>30</result>