A conical container with a height of 30 cm is filled with water, and the water is poured into a cylindrical container with the same height as the bottom. What is the height of the water surface in the cylindrical container?
高30厘米的圆锥形容器盛满水，把水倒入和它等底等高的圆柱形容器中去，圆柱形容器中水面的高度是多少厘米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<result>10</result>