Fill a cylindrical container with a height of 15 cm with water, and then pour all the water into a conical container with the same bottom. What is the height of the water surface in cm?
在高15厘米的圆柱形容器中装满水，再全部倒入等底的圆锥形容器中，水面高应是多少厘米．
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>