If the volume difference between a cone and a cylinder with the same base and height is 30 cubic centimeters, what is the volume of the cone in cubic centimeters?
一个圆锥体与和它等底等高的圆柱体体积相差30立方厘米，这个圆锥体的体积是多少立方厘米．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<result>15</result>