There are 200 grams of sugar water with 10% sugar content. How many grams of water should be added to obtain sugar water with 5% sugar content?
现有含糖10%的糖水200克，要想得到含糖5%的糖水，该加入多少克的水呢？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/10) / (1/20)</gadget>
<output>2</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<gadget id="calculator">400 - 200</gadget>
<output>200</output>

<result>200</result>