Boys in class 51 account for 3/7 of the whole class, and how many girls account for the whole class.
五1班男生占全班人数的(3/7)，女生占全班人数的多少．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

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