Boys account for the number of girls (3/5), and how many girls account for boys
男生占女生人数的(3/5)，女生占男生的多少
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/5)</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>