Boys in Class 1 account for 4/9 of the whole class, and the number of girls is equal to the number of boys.
六1班男生占全班的(4/9)，女生人数相当于男生的多少．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(5/9) / (4/9)</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>