A liquid medicine, the mass ratio of powder to water is 1:200. Now use 150 grams of medicinal powder to make liquid medicine, how many grams of water should be added?
一种药水，药粉与水的质量比是1：200．现在用150克的药粉配药水，需加水多少克的水？
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">150 / (1/200)</gadget>
<output>30_000</output>

<result>30_000</result>