Khối 6 của một trường có tổng cộng 90 học sinh. Trong dịp tổng kết cuối năm thống kê được: Số học sinh giỏi bằng \[\frac{1}{6}\] số học sinh cả khối, số học sinh khá bằng 40% số học sinh cả khối. Số học sinh trung bình bằng \[\frac{1}{3}\] số học sinh cả khối, còn lại là học sinh yếu kém. Tính số học sinh mỗi loại.

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