A conical container is filled with 60mL of water, the height of the water surface is exactly half of the height of the cone. How many milliliters of water can this container hold?
圆锥形容器中装有60mL水，水面高度正好是圆锥高度的一半．这个容器里还能装多少毫升的水？
<gadget id="calculator">60 * 8</gadget>
<output>480</output>

<gadget id="calculator">480 - 60</gadget>
<output>420</output>

<result>420</result>