If the difference between the volume of a cone and a cylinder with the same base and height is 20 cubic meters, what is the volume of the cylinder in cubic meters?
一个圆锥和与它等底等高的圆柱的体积之差是20立方米，圆柱的体积是多少立方米．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<result>30</result>