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Cognitive Reflection Test (CRT)

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A two-volume set of books is on a shelf in correct order (Vol. 1, Vol. 2). Each cover is 1/8 inch thick, and the pages of each book are 1 inch thick. A bookworm starts on the first page of Volume 1 and eats in a straight line to the last page of Volume 2. What is the total distance the bookworm travels?
Correct Answer:
1/4 inch

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