Math

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How do I set this up and solve it?

Tom has a collection of 30 CDs and Nita has a collection of 15 CDs. Tom is adding 1 CD a month to his collection while Nita is adding 4 CDs a month to her collection. Find the number of months after which they will have the same number of CDs.

  • Math -

    Tom 30 + n
    Nita 15 + 4 n

    30 + n = 15 + 4 n

    15 = 3 n

    n = 5

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