In a math competition, the number of people who fail is the number of people who pass (1/9), how many people in this class who pass the math competition account for the number of people in the class.
在一次数学竞赛中，不及格人数是及格人数的(1/9)，这班数学竞赛中及格人数占全班人数的多少．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 + (1/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">1 / (10/9)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>