Lớp 6A có 45 học sinh gồm ba loại: giỏi, khá, trung bình.Trong đó 40% số học sinh loại khá.Số học sinh đạt loại giỏi bằng 4 phân5 số học sinh còn lại. a) Tính số học sinh loại trung bình của lớp 6A B)Biết số học sinh loại giỏi bằng 5 phần6 số học sinh nữ 6A tính tỉ số phần trăm giữa số học sinh nữ và tổng số học sinh của 6A

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