The elder brother is taller than the younger brother (1/5), so how much shorter is the younger brother than the elder brother?
哥哥比弟弟高(1/5)，那么弟弟比哥哥矮多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(1/5) / (6/5)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>