The volume of a cylinder is 30 cubic decimeters, the radius of the base of a cone is twice the radius of the base of the cylinder, and the height is three times that of the cylinder, what is the volume of the cone?
一个圆柱的体积是30立方分米，一个圆锥的底面半径是圆柱底面半径的2倍，高是圆柱的3倍，求圆锥的体积是多少？
<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<result>120</result>