A cylinder has the same volume as a cone. If the base area of the cylinder is half that of the cone and the height of the cylinder is 30 cm, what is the height of the cone in cm?
一个圆柱与一个圆锥的体积相等，如果圆柱的底面积是圆锥的一半，圆柱的高是30厘米，那么圆锥的高是多少厘米．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>