In brine with 20% saline, how much less salt is there than in brine
在含盐量20%的盐水中，盐比盐水少多少
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>