The number of boys in Class 1 is the number of girls (7/9), and the number of girls accounts for the number of people in the class.
六1班男生人数是女生人数的(7/9)，女生人数占全班人数的多少．
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 + (7/9)</gadget>
<output>16/9 = around 1.777778</output>

<gadget id="calculator">1 / (16/9)</gadget>
<output>9/16 = around 0.5625</output>

<result>9/16 = around 0.5625</result>