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Math Help - bacteria

  1. #1
    Junior Member
    Joined
    Sep 2008
    Posts
    27

    bacteria

    If a bacteria population doubles in 5 days, when will it be 16 times as large?
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  2. #2
    Newbie
    Joined
    Oct 2008
    Posts
    3
    Starts as x
    5 days 2x (twice as big)
    10 days 4x (twice the 2x)
    15 days 8x (twice the 4x)
    20 days 16x (twice the 8x)

    20 days
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