Xiaohua's height is shorter than Xiaohong's (1/5), then how much is Xiaohong's height taller than Xiaohua
小华的身高比小红要矮(1/5)，则小红的身高比小华高多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) / (4/5)</gadget>
<output>1/4 = around 0.25</output>

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