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3 March, 09:02

A colony of Fruit Flies triples every 30 minutes. If there are 19 683 Fruit Flies now, how many were present 2 hours ago?

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  1. 3 March, 09:52
    0
    Number 30 previous to current = 19683 / 3 = 6561

    1 hour previous = 6561 / 3 = 2187

    1.5 hours previous = 729

    2 hours previous = 243
  2. 3 March, 12:06
    0
    2 hours = 4 periods of 30 minutes

    19683/3=6561

    6561/3=2187

    2187/3=729

    729/3=243

    Or alternatively:

    you can divide by 81:

    19683/81=243

    There were 243 fruit flies
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