cylinder and a cone have the same volume and base area, the height of the cylinder is 5 cm, what is the height of the cone?
一个圆柱体和一个圆锥体的体积、底面积都相等，圆柱高5厘米，圆锥的高是多少．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>