The ratio of the number of boys and girls in Class 1 is 6:7, and the number of girls is the number of the whole class ((())/(())).
六1班男、女生人数的比是6：7，女生人数是全班人数的((())/(()))．
<gadget id="calculator">6 + 7</gadget>
<output>13</output>

<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<result>7/13 = around 0.538462</result>