Boys in class 61 account for 45% of the whole class, and there are more girls than boys ((())/(())).
六1班男生占全班的45%，女生比男生多((())/(()))．
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20) - (9/20)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) / (9/20)</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>