Put table salt into water to make brine. At this time, the salt content of brine is 10%. How much less salt is added than water?
把食盐放人水中配成盐水，这时盐水的含盐量是10%，放人的盐比水少多少
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(9/10) - (1/10)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / (9/10)</gadget>
<output>8/9 = around 0.888889</output>

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