A cylinder and a cone have the same base and height, and the volume of the cylinder is 20 cubic decimeters larger than that of the cone. What is the volume of the cylinder?
一个圆柱与一个圆锥等底等高，圆柱体积比圆锥体积多20立方分米，这个圆柱的体积是多少立方分米？
<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>