The number of boys accounts for the whole class (5/9), what is the number of girls in the whole class
男生人数占全班的(5/9)，则女生人数占全班的多少
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

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