There are 5 liters of salad oil, how many milliliters are left after pouring half of it.
装有5升的色拉油，倒了一半后，还剩多少毫升．
<gadget id="calculator">5 * 1_000</gadget>
<output>5_000</output>

<gadget id="calculator">5_000 / 2</gadget>
<output>2_500</output>

<result>2_500</result>