The number of sixth grade boys is the number of the whole class (3/7), and the number of sixth grade girls is the number of boys.
六年级男生人数是全班人数的(3/7)，六年级女生人数是男生人数的多少．
<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>

<gadget id="calculator">(4/7) / (3/7)</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>