In a final exam, 95% of the students in Class 6 and 2 passed Chinese, 91% passed both language and mathematics, 2% failed language and mathematics, and how many students passed mathematics.
在一次期末考试中，六2班学生中95%语文及格，有91%的学生语、数都及格，2%的学生语、数都不及格，数学及格的学生占多少．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">91 / 100</gadget>
<output>91/100 = around 0.91</output>

<gadget id="calculator">(19/20) - (91/100)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">1 - (1/25) - (1/50)</gadget>
<output>47/50 = around 0.94</output>

<result>47/50 = around 0.94</result>