In a glass of sugar water, the sugar content is 10% of the sugar water. How many grams of water are there in 500 grams of sugar water?
一杯糖水中，糖的含量是糖水的10%，500克这样的糖水中，水有多少克？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">500 * (9/10)</gadget>
<output>450</output>

<result>450</result>