The number of boys in class one of six years accounts for (7/13) of the whole class, and the number of girls in this class is ((())/(())).
六年一班男生占全班人数的(7/13)，这个班女生人数是男生人数的((())/(()))．
<gadget id="calculator">13 - 7</gadget>
<output>6</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>