In a class, boys are girls (3/4), how many girls account for the whole class.
某班男生是女生的(3/4)，女生占全班人数的多少．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>