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Urgent! It is best to use equations to ask math problems.
Suppose there are x literature books, then there are 0.8x science books.

0.8x+x=5400 x=3000 copies 9÷ 10=0.9.

3000×0.9=2700 copies

2700-2400=300 copies

therefore

The library bought 300 science and technology books.

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