An inverted conical container contains 5 liters of water, the height of which is exactly half of the total height of the container. How many liters of water can there be in the container?
一个倒立的圆锥体容器内装水5升，水面高度正好是容器总高度的一半．则该容器内还能多少升水．
<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<gadget id="calculator">40 - 5</gadget>
<output>35</output>

<result>35</result>