Put 250 grams of medicinal powder in 1000 grams of water to make a potion. How much does the weight of the medicinal powder account for in the potion?
在1000克水中放入250克药粉配制成药水，药粉重量占药水的多少
<gadget id="calculator">1_000 + 250</gadget>
<output>1_250</output>

<gadget id="calculator">250 / 1_250</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>