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1 September, 15:25

A bacteria culture doubles every hour. If there are 15 000 bacteria now, how many bacteria were there 6 hours ago?

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  1. 1 September, 16:09
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    234.375 or about 234.

    Half it several times to get the answer.

    15000/2=7500 (1 hour ago)

    7500/2 = 3750 (2 hours ago)

    3750/2 = 1875 (3 hours ago)

    1875/2=937.5 (4 hours ago)

    937.5/2 = 468.75 (5 hours ago)

    468.75/2 = 234.375 (6 hours ago)

    Therefore, there were 234.375 or about 234 bacteria 6 hours ago.
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