How many measuring cups can be filled by pouring 2 liters of water into a 500ml measuring cup?
把2升水倒入500毫升的量杯，可以倒满多少个量杯．
<gadget id="calculator">2 * 1_000</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 500</gadget>
<output>4</output>

<result>4</result>