The number of students in a class who has not reached the standard (1/4) is the number of students who have reached the standard. If there are 2 more students who have reached the standard, the number of students who have reached the standard is not (1/3). What is the number of students in the class?
某班学生体育达标人数是没有达标人数的(1/4)，如果又有2名达标，达标人数是没有达标人数的(1/3)，全班人数是多少人．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

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

<result>40</result>