smodak wrote:

Susan has a 5-foot long bookshelf that she wants to fill with 22 books of differing sizes. Each book can fit on the shelf, but they cannot all fit on the shelf. In order to fit all of her books on the same shelf, she would need a 5.5-foot long bookshelf. What is the maximum number of books she can fit on her shelf?

(1) The 8 thinnest books each have a thickness of 2 inches.

(2) The 2 thickest books each have a thickness of 5 inches.

65 inch can accommodate all the books. But have to find the max number of books that can be accomodated in 5 foot long bookshelf.

This could be done by avoiding the thickest books.

If you avoid one 5inch thickest book.

Number of books = 22-1 = 21

total thickness = 65-5 = 60 = 5 feet

Hence 21 books can be accommodated. Sufficient.

Hence B

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