Cut a piece of cylindrical wood into the largest cone. If the volume of the cone is 30dm**3, what is the volume of the original wood.
用一段圆柱体木料削成一个最大的圆锥．如果圆锥的体积是30dm**3，那么原来木料的体积是多少．
<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>