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The number of literary books bought by schools is two-thirds of story books and five-eighths of science and technology books. Buy 240 story books. How many science books did you buy?
256 science and technology books.

The calculation process is as follows:

Number of literary books: 240 x 2/3 = 160 (book)

Number of sci-tech books: 160 ÷ 5/8 = 256 (copies)

I bought 256 science and technology books.

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