[Step-by-Step] There is a sensitive-survey among certain students. The survey consists in two steps: 1 . choose randomly a ball from a box that has 65 red
Question: There is a sensitive-survey among certain students. The survey consists in two steps: 1 . choose randomly a ball from a box that has 65 red ball and 35 white ball; 2. if a white ball is drawn, answer the question: were you born before July 1 (Yes or No), if a red ball is drawn, answer the question: have you ever used illegal drugs (Yes or No). After the survey, 1765 ballots were collected, and there were 309 Yes ballots. Can you use the information to figure out the percentage of students who had used illegal drugs?
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