The third class of the sixth grade originally planned to draw the whole class (1/5) to participate in the general cleaning. Later, 2 students came to participate actively. The actual number of people who participated in the general cleaning was not (1/3). How many students are there in Class 3, Grade 6?
六年级三班原计划抽全班人数的(1/5)参加大扫除，后来又来了2个同学主动参加，实际参加大扫除的人数是未参加的(1/3)．六年级三班共有学生多少人？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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