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Science and technology books in the library
The simplest: there are XX story books. For example, if there are 150 storybooks, then the science and technology books are: 150 * 2 = 300 (books).

More complicated: two kinds of books ***XX. For example, there are 450 science and technology books and story books.

Solution: Suppose there are X science books, then there are 2x story books. Equation:

x+2x=450

3x=450

x= 150

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