There are more boys than girls in Class 61 (1/5), so how much fewer girls are there than boys?
六一班的男生人数比女生多(1/5)，那么女生人数比男生少多少
<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>