For a cup of sugar water, the ratio of sugar to water is 1:20, sugar accounts for ((())/(())).
一杯糖水，糖和水的比是1：20，糖占糖水的((())/(()))．
<gadget id="calculator">1 + 20</gadget>
<output>21</output>

<gadget id="calculator">1 / 21</gadget>
<output>1/21 = around 0.047619</output>

<result>1/21 = around 0.047619</result>