In a glass of sugar water, pour a spoonful of water, the sugar content becomes 25%; if you pour another spoonful of water, the sugar content drops to 20%, if you continue to pour 3 spoonfuls of this water into the cup, How much sugar content will be reduced.
在一杯糖水中，倒入一勺水，含糖率就变成25%；如果再倒入一勺水，含糖率降低到20%，如果继续向杯中再倒入3勺这样的水，含糖率将会降到多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / (1/4)</gadget>
<output>4</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>