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There are some in the bookcase.
Suppose there are three science books, then there are 5X story books.

(3X+60)/(8X+60)=7/ 12

The solution is X= 15.

So there are 45 science books.

There are 75 story books.

The total number of science and technology books and story books in this class is 45+75= 120 ~ ~

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