Một người qua đường hỏi ông lão chăn vịt: " Đàn vịt của ông có bao nhiêu con?".Ông lão trả lời : -Một nửa số vịt của tôi thêm một nửa con vịt nữa đang tắm mát dưới sông.- -Ba phần tư số vịt còn lại thêm một phần tư con nữa đang kiếm ăn ở dưới hồ. -Bốn phần năm số con vịt còn lại thêm một phần năm con nữa đang nằm nghỉ ở trên bờ. - Cuối cùng còn ba đôi vịt què tôi đang nhốt ở trong lồng kìa! Hỏi đàn vịt của ông lão có bao nhiêu con?

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