Lele took part in the math contest with a total of 10 questions. Every time he does a problem correctly, he gets 8 points. He made a wrong question and got 5 points. He finally got 54 points in the exam. How many mistakes did he make? Assuming that all the questions 10 correspond to 80 points, we get 54 points here, which is 26 points less, because two questions are wrong: (8X 10-54)/(8+5)=2 (road).

Or suppose all the questions are wrong, you deserve -50 points, here you get 54 points, and you get 104 points, because you answered 8 questions correctly: (5X 10+54)/(8+5)=8 (Tao).

10-8=2 (Tao) A: He made two mistakes.