The number of boys in the sixth grade is the number of girls (9/11), and the number of girls accounts for the number of the whole class.
六年级男生人数是女生人数的(9/11)，女生人数占全班人数的多少．
<gadget id="calculator">9 / 11</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">1 * (9/11)</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">(9/11) + 1</gadget>
<output>20/11 = around 1.818182</output>

<gadget id="calculator">1 / (20/11)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>