The sixth grade students of Guangming Primary School participated in the mathematics competition, and the winning rate was 40%. There were 36 first prizes, 72 second prizes, and 216 third prizes. How many students participated in the competition?
光明小学六年级同学参加数学竞赛，获奖率为40%，一等奖36人，二等奖72人，三等奖216人，参加竞赛的学生有多少人？
<gadget id="calculator">36 + 72 + 216</gadget>
<output>324</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">324 / (2/5)</gadget>
<output>810</output>

<result>810</result>