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There are three kinds of books in the school library: story books, science books and comic books.
( 1) 1/3/( 1+ 1/3)= 1/4

(2)120 * (1+1/3) =160 (Ben)

160 * (1-3/8) =100 (Ben)

Science and technology books are less than story books 1/4, and comic books have 100.

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