In a class in a test, 2 students failed, the pass rate is 95%, how many students are there in this class?
某班在一次检测中，有2名学生不及格，及格率是95%，该班共有学生多少人．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2 / (1/20)</gadget>
<output>40</output>

<result>40</result>