Prepare a kind of sugar water, the mass ratio of sugar and water is 1:9, what is the water content of this sugar water.
配置一种糖水，糖和水的质量比为1：9，这种糖水的含水率是多少．
<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

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

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

<result>9/10 = around 0.9</result>