The ratio of a liquid medicine to water is 1:300, and now there are 10 grams of liquid medicine, how many kilograms of water should be added.
一种药液和水的比是1：300，现在有药液10克，应加水多少千克．
<gadget id="calculator">1 / 300</gadget>
<output>1/300 = around 0.003333</output>

<gadget id="calculator">10 / (1/300) / 1_000</gadget>
<output>3</output>

<result>3</result>