When Class 1 of the sixth grade organized a mathematics interest group activity, the number of students who participated was the number of students who did not participate (3/7). Later, 5 people joined, and the number of students who participated at this time was the number of students who did not participate (2/3). How many people are there in class six?
六年级一班组织数学兴趣小组活动时，参加的同学是未参加同学人数的(3/7)，后来又有5人参加，这时参加的同学是未参加同学人数的(2/3)．六级一班一共有多少人？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) - (3/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5 / (1/10)</gadget>
<output>50</output>

<result>50</result>