A cylinder and a cone with the same base and height, the volume of the cylinder is 30 cubic decimeters more than that of the cone, what is the volume of the cone?
等底等高的圆柱和圆锥，圆柱的体积比圆锥的多30立方分米，圆锥的体积是多少立方分米．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<result>15</result>