The number of boys accounts for the number of girls (8/9), and the number of girls accounts for the number of the whole class
男生人数占女生人数的(8/9)，女生人数占全班人数的多少
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 + (8/9)</gadget>
<output>17/9 = around 1.888889</output>

<gadget id="calculator">1 / (17/9)</gadget>
<output>9/17 = around 0.529412</output>

<result>9/17 = around 0.529412</result>