Khối 6 của một trường có 4 lớp. Số học sinh lớp 6A bằng 9/25 tổng số học sinh 3 lớp còn lại. Số học sinh lớp 6B bằng 21/64 tổng số học sinh 3 lớp còn lại. Số học sinh lớp 6C bằng 4/13 tổng số học sinh 3 lớp còn lại. Số học sinh lớp 6D là 43 bạn. Hỏi tổng số học sinh khối 6 của trường đó và số học sinh mỗi lớp.

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