If boys account for 5/9 of the class, what percentage of girls are in the class?
男生占全班人数的(5/9)，则女生占全班人数的多少
<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>