There is 5L of liquid medicine, and each bottle is divided into 2.5mL vials, how many vials are needed.
有药液5L，用每瓶2.5mL的小瓶来分装，需要多少小瓶．
<gadget id="calculator">5 * 1_000</gadget>
<output>5_000</output>

<gadget id="calculator">5_000 / 2.5</gadget>
<output>2_000</output>

<result>2_000</result>