Solution #63: Bookworm

Only 1/4 inch -- the thickness of the two covers. Put a paperclip on the first page of one book, and another on the last page of a second book. Put both books on a shelf together, the first on the left and the second on the right, and you will see why this surprising answer is correct.
Source: Fixx, James F
Categories: Reasoning, Pitfall, Fractions
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