There is a cylinder and a cone with base radii and volumes equal to each other. If the height of the cylinder is increased by 12 cm, then the height of the cylinder is equal to the height of the cone. What is the height of the cone in centimeters.
有一个圆柱和一个圆锥，它们的底面半径和体积分别相等．如果圆柱的高增加12厘米，那么圆柱的高就和圆锥的高相等．圆锥的高是多少厘米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 / (2/3)</gadget>
<output>18</output>

<result>18</result>