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On Children's Day, Dongdong bought two sets of books, Fairy Tale World and Sea World, and went to 260 yuan at the price of a set of fairy tale world books.

Solution: Suppose the price of a set of Ocean World series is X yuan.

Then: the price of a fairy tale world series is five-eighths of X yuan.

D: X+ five eighths X=260.

X= 160

A: The price of Sea World Series 1 is 160 yuan.

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