The radius of the base of a cone is 3 times the radius of the base of a cylinder with the same height. The volume of the cylinder is 24 cubic decimeters. What is the volume of the cone?
一个圆锥的底面半径是与它等高的一个圆柱底面半径的3倍，已知圆柱的体积是24立方分米，圆锥的体积是多少立方分米．
<gadget id="calculator">24 * 3</gadget>
<output>72</output>

<result>72</result>