Xinhua Bookstore delivered a batch of children's books, which sold 1800 in the first day, 19 more in the second day than in the first day, and the remaining 37 sold out in the third day?

([1800 × (1 + 19) + 1800] / (1-37) = (2000 + 1800) / (47, = 3800 × 74, = 6650 (copies); a: there are 6650 children's books in this batch

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