If 100 grams of sugar is added to a glass of 400 grams of water, what is the sugar content of this glass of sugar water?
在一杯400克的水中加入100克糖，那么这杯糖水的含糖率是多少．
<gadget id="calculator">400 + 100</gadget>
<output>500</output>

<gadget id="calculator">100 / 500</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/5) * 1</gadget>
<output>1/5 = around 0.2</output>

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