Grade 6 students take a math test, 171 pass and 9 fail, what is the passing rate of this test?
六年级同学参加一次数学考试，有171人及格，有9人不及格，这次考试的及格率是多少．
<gadget id="calculator">171 + 9</gadget>
<output>180</output>

<gadget id="calculator">171 / 180</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(19/20) * 1</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>