Cut a cylinder into a cone with the same base and height, the volume of the cut part is 42dm**3, what is the volume of the cone dm**3.
把一个圆柱削成一个和它等底等高的圆锥，削去部分的体积是42dm**3，圆锥的体积是多少dm**3．
<gadget id="calculator">42 / 2</gadget>
<output>21</output>

<result>21</result>