Fill a conical container with a height of 18 cm with water, and then pour all the water into a cylindrical container with the same bottom. What is the height of the water surface in cm?
在高18厘米的圆锥形容器中装满水，再全部倒入等底的圆柱形容器中，水面高应是多少厘米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 * (1/3)</gadget>
<output>6</output>

<result>6</result>