If 8 liters of water are contained in an inverted cone, the height of the water surface is exactly half the height of the cone, how many liters of water can the container hold?
倒置的圆锥容器中装有8升水，水面高度正好是圆锥高度的一半，这个容器还能装多少升水．
<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">64 - 8</gadget>
<output>56</output>

<result>56</result>