a) Bạn Lan có một chiếc lọ trong đó chứa các viên bị đỏ và bi xanh với số bi đỏ gấp 2 lần số bi xanh. Biết rằng khi bạn Lan lấy ra 5 viên bi đỏ và 3 viên bi xanh thì số bi trong lọ còn lại là 22 viên. Hỏi trong lọ ban đầu bạn Lan có bao nhiêu viên bi đỏ, bao nhiêu viên bi xanh?

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