The teacher gave 200 questions for Wang Liang, Li Tao and Zhang Qing to do. Each of them did 120 right questions. And each question was right. If we call the questions that three people did right simple questions, and only one person did right difficult questions, then there are more difficult questions than simple questions______ Tao

The teacher gave 200 questions for Wang Liang, Li Tao and Zhang Qing to do. Each of them did 120 right questions. And each question was right. If we call the questions that three people did right simple questions, and only one person did right difficult questions, then there are more difficult questions than simple questions______ Tao

According to the meaning of the question, we can get the formula: difficult + middle + simple = 200 (1) 120 × 3 - (middle + 3 simple) + simple = 200360 - middle - 2 simple = 200 middle + 2 simple = 160 By subtracting, we can get: difficult simple = 200-160 = 40. A: there are 40 more difficult questions than simple ones