The school carries out large recess activities. One-third (1/3) of the students in Class 1 participate in rope skipping activities, 25% of the students participate in table tennis, and the remaining 20 students all play football. How many people are there in Class 1?
学校开展大课间活动，六1班有(1/3)的学生参加跳绳活动，25%的学生参加乒乓球活动，剩下的20人全部踢足球，六1班共有多少人？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/3) - (1/4)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">20 / (5/12)</gadget>
<output>48</output>

<result>48</result>