Answer:
8 5/8 lb
Explanation:
The dog weighs 23 lb and the cat weighs (5/8)(23 lb).
The amount by which the dog's weight exceeds the cat's is
(1)(23 lb) - (5/8)(23 lb), or (3/8)(23 lb) = 69/8 lb, or 8 5/8 lb (answer)
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