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25 January, 10:09

19. Tom has a collection of 30 CDs and Nita has a collection of 18 CDs. Tom is adding 1 CD a month to his collection while Nita is adding 5 CDs a month to her collection. Find the number of months after which they will have the same number of CDs. Show your work.

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  1. 25 January, 10:38
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    M = number of months ...

    30 + m = 18 + 5m

    30 - 18 = 5m - m

    12 = 4m

    12/4 = m

    3 = m < = = they will have the same amount at 3 months

    check ...

    30 + 3 = 18 + 5 (3)

    33 = 18 + 15

    33 = 33 (correct)
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