Girls account for the whole class (2/6), and boys account for the number of the whole class.
女生占全班人数的(2/6)，男生占全班人数的多少．
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>