If a conical container with a height of 12 cm is filled with water and poured into a cylindrical container with the same area as its bottom, what is the height of the water surface in cm?
把一个高12厘米的圆锥形容器装满水后倒入与它底面积相等的圆柱形容器中，水面高多少厘米．
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<result>4</result>