The fifth grade students are going to plant trees. There are 45 students in Class 5 1, 46 students in Class 5 2, and 43 students in Class 5 3. The teacher wants to divide the whole class into groups of 3 people, and how many classes can be divided exactly.
五年级同学去植树，五1班有45人、五2班有46人、五3班有43人、老师想将全班同学每3个人分为一个组，多少班的同学能正好分完．
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