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There are 2400 science and technology books, and 500 comics are less than science and technology books. How many comic books are there?
4300 copies.

Comic books =2400*2-500=4800 (Ben), because the number of comic books is twice that of science books, so the number of science books is 2400 times 2, and because the number of comic books is 500 less than that of science books, the number of science books is 2400 times 2 and then MINUS 500.

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