The number of boys in Class 1 is the number of girls (5/9), and the number of boys is the number of the whole class.
六1班男生人数是女生的(5/9)，男生是全班人数的多少．
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 + (5/9)</gadget>
<output>14/9 = around 1.555556</output>

<gadget id="calculator">(5/9) / (14/9)</gadget>
<output>5/14 = around 0.357143</output>

<result>5/14 = around 0.357143</result>