Each bottle of beverage is 450ml, and there are 20 bottles in one box. How many liters are there in this box of drinks?
每瓶饮料450毫升，一箱共有20瓶．这箱饮料一共多少升．
<gadget id="calculator">450 * 20</gadget>
<output>9_000</output>

<gadget id="calculator">9_000 / 1_000</gadget>
<output>9</output>

<result>9</result>