Put 20 grams of sugar into 200 grams of water. After standing for 3 days, the weight of the sugar water is only 200 grams. What is the concentration of the sugar water at this time?
20克糖放入200克水中，放置3天后，糖水重量只有200克，这时糖水的浓度是多少？
<gadget id="calculator">20 / 200</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>