A bottle of 1800ml juice can just fill 4 cups, how many milliliters of juice can each cup hold.
一瓶1800毫升的果汁，正好可以倒满4杯，每杯可装果汁多少毫升．
<gadget id="calculator">1_800 / 4</gadget>
<output>450</output>

<result>450</result>