مilton لديه بعض الكتب عن علم الحيوان و يملك أيضا أربعة أضعاف هذا العدد من الكتب عن علم النبات. إذا كان إجمالي كتبه 80 كتاباً، فكم عدد كتب علم الحيوان التي يملكها؟
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