There are nine questions left. If all nine questions are answered correctly, you can get 45 points, but now you have to get at least 22 points to win the prize, that is, the score difference during the period is 45-22=23 points. If you answer a question correctly, the score difference is 5+ 1=6 points, and 23/6=3. More than five questions, that is to say, you can only answer three questions correctly at most, and you can win the prize by answering at least six questions correctly.