When a cylinder and a cone have the same base area and volume, the height of the cone is 12 cm; what is the height of the cylinder?
一个圆柱和一个圆锥底面积和体积相等时，圆锥的高是12厘米；圆柱的高是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 * (1/3)</gadget>
<output>4</output>

<result>4</result>