The ratio of boys to girls in grade five is 7:6, how many girls account for the number of grade five
五年级男、女生人数比是7﹕6，女生人数占五年级的多少
<gadget id="calculator">7 + 6</gadget>
<output>13</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<result>6/13 = around 0.461538</result>