The school carried out the "Chinese Dream, My Dream" essay competition. A total of 400 people participated, including 10 people who won the first prize of the school, 20 people who won the second prize, and 50 people who won the third prize. The number of winners accounted for the total number of students. What fraction of?
学校开展"中国梦，我的梦"征文活动，共有400人参加，其中获得学校一等奖的有10人，二等奖的有20人，三等奖的有50人，获奖人数占总人数的几分之几？
<gadget id="calculator">80 / 400</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>