Ba lớp 7A 7B 7C có 94 học sinh tham gia trồng cây. Mỗi học sinh lớp 7A trồng được 3 cây, Mỗi học sinh lớp 7B trồng được 4 cây,Mỗi học sinh lớp 7C trồng được 5 cây. Hỏi mỗi lớp có bao nhiêu học sinh. Biết rằng mỗi lớp trồng được số cây như nhau.
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