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If each book's weight is \(\frac{\mathrm{1} }{\mathrm{3} }\) pounds, how many paperback books together weigh 25 pounds?

A 75

If each book weighs \( \frac{\mathrm{1} }{\mathrm{3} }\) pound, then 1 pound = 3 books. To find the number of books in 25 pounds, simply multiply this 3 by 25: 25×3=75.