A bottle of shampoo is 500 ml, how many bottles of this shampoo is 2 liters.
一瓶洗发水500毫升，多少瓶这样的洗发水是2升．
<gadget id="calculator">2 * 1_000</gadget>
<output>2_000</output>

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

<result>4</result>