In a glass of sugar water, sugar accounts for (1/10) of the sugar water, how much less sugar than water.
在一杯糖水中，糖占糖水的(1/10)，糖比水少多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<result>8/9 = around 0.888889</result>