There are 20% more boys than girls, and the number of girls is the number of boys
男生比女生多20%，女生人数是男生人数的多少
<gadget id="calculator">20 / 100</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 / (6/5)</gadget>
<output>5/6 = around 0.833333</output>

<result>5/6 = around 0.833333</result>