1. Con trai hỏi mẹ: “Mẹ ơi, mẹ bao nhiêu tuổi?” . Mẹ trả lời: “Tuổi con bây giờ bằng ¼ tuổi mẹ trước đây 8 năm. Sau 8 năm nữa thì tuổi con lúc đó sẽ bằng 2/5 tuổi mẹ bây giờ. Em hãy cho biết, tuổi mẹ bây giờ là bao nhiêu? -- MỌI NGƯỜI VẼ SƠ ĐỒ RA GIẤY

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