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There are 32 picture books and 88 story books in Xiao Gan's bookcase. Picture books occupy this bookshelf.
32÷(32+88)

=32÷ 120

=4/ 15

88÷32 = 88/32 =11/4 = 3 and 3/4.

Answer: Picture books account for 4/ 15 of all books in this bookcase, and the number of story books is three times that of picture books.

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