A conical container is 30cm high. Fill it with water and pour it into a cylindrical container with the same bottom. What is the height of the water surface at this time?
一个圆锥形容器高30cm，将它装满水倒入与它等底的圆柱形容器中，此时水面的高是多少．
<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<result>10</result>