There are 84 students in class one and class two, and 136 students in class two and class three? Please review the topic
84 + 136 = 220 two classes 2. The number of class 1 and class 3 is 136-84 = 52. The number of class 3 is 52 more than that of class 1. Among the 220 people, in addition to class 3 and class 1, there are two classes 2. The number of class 2 is at least 220 / 2 = 110. The number of class 2 is the most