In a glass of sugar water, sugar accounts for 1/5 of the sugar water, and how much sugar accounts for water.
在一杯糖水中，糖占糖水的(1/5)，糖占水的多少．
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>