To prepare a liquid medicine, 500 grams of water needs to be added to 4 grams of medicinal powder. Now there are 600 grams of water, how many grams of powder need to be added? (Solve with ratio)
配制一种药水，用4克药粉需加水500克．现在有水600克，需加药粉多少克？(用比例解)
<gadget id="calculator">4 / 500</gadget>
<output>1/125 = around 0.008</output>

<gadget id="calculator">(1/125) * 600</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>