Học kì I số học sinh giỏi của lớp 6A bằng 2/7 số học sinh còn lại. Sang học kì II số học sinh giỏi tăng thêm 8 bạn (số học sinh cả lớp); nên số học sinh giỏi bằng 2/3 số còn lại. Hỏi học sinh kỳ I lớp 6a có bao nhiêu học sinh giỏi

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