The number of students who have reached the standard in a certain class is not (1/4). If two more students reach the standard, the number of students who have reached the standard is not (1/3). What is the number of students in the class?
某班学生的达标人数是没有达标人数的(1/4)，如果又有2人达标，这时达标人数是没有达标人数的(1/3)，那么全班人数是多少人
<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>