Bài 6: Khối 6 của một trường THCS có ba lớp gồm 120 học sinh. Số học sinh lớp 6A bằng $\frac{1}{2}$ tổng số học sinh hai lớp 6B và 6C. Số học sinh lớp 6B ít hơn lớp 6C là 6 học sinh. Tính số học sinh mỗi lớp. Bài 7: Số học sinh lớp 6A bằng $\frac{4}{5}$ số học sinh lớp 6B. Nếu chuyển 6 bạn ở lớp 6B sang lớp 6A thì số học sinh lớp 6A bằng $\frac{14}{13}$ số học sinh lớp 6B. Tính số học sinh lúc đầu ở mỗi lớp.

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