The volume of a cylinder is 30 cm**3 larger than the volume of a cone with the same base and height. What is the volume of the cone in cm**3.
一个圆柱体的体积比和它等底等高的圆锥体的体积大30厘米**3，这个圆锥体的体积是多少厘米**3．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<result>15</result>