Boys account for (5/12) of the class and girls account for ((())/(())).
男生占全班人数的(5/12)，女生人数占男生人数的((())/(()))．
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(7/12) / (5/12)</gadget>
<output>7/5 = around 1.4</output>

<result>7/5 = around 1.4</result>