The number of people who participated in the literature and art group in a certain class was the number of people who did not participate (1/4). Later, 5 students came to participate. At this time, the number of people who participated was the number of people who did not participate (3/7).
某班参加文艺小组的人数是未参加人数的(1/4)，后来又有5名学生来参加，这时参加人数是未参加人数的(3/7)，该班有学生多少人？
<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">1 + 4</gadget>
<output>5</output>

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

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

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

<result>50</result>