Will the first 10 volumes of a 20-volume encyclopedia fit upright in the bookrack shown above?

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Bookrack.PNG
Will the first 10 volumes of a 20-volume encyclopedia fit upright in the bookrack shown above?

(1) \(x = 50\) centimeters.
(2) Twelve of the volumes have an average (arithmetic mean) thickness of 5 centimeters.

Answer: E

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