The concentration of a certain pesticide is 25%. If 600 grams of this pesticide is to be diluted with water into a 3% potion, how many grams of water should be added?
某种农药的浓度是25%，现要将600克的这种农药添水稀释成3%的药水，应该添水多少克．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">600 * (1/4)</gadget>
<output>150</output>

<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">150 / (3/100)</gadget>
<output>5_000</output>

<gadget id="calculator">5_000 - 600</gadget>
<output>4_400</output>

<result>4_400</result>