The number of boys in class one of six years accounts for the whole class (5/11), so the number of girls is the number of boys.
六年一班男生人数占全班人数的(5/11)，那么女生人数是男生人数的多少．
<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">1 - (5/11)</gadget>
<output>6/11 = around 0.545455</output>

<gadget id="calculator">(6/11) / (5/11)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>