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The number of library books in a school increased by 20% after it bought new books in may. The number increased by another 20% after a bookstore donated 300 books in June. Find the number of books in the library before it bought new books in May.

  • Math -

    after buy 1.2 n
    after donation 1.2*1.2 n

    300 = .2 * 1.2 n
    300 = .24 n
    n = 1250

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