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Bacteria 10,000 after 3 hours and 40,000 after 5 hours: how many at the start

The same question, asked 2 times: 9 May 2023 S2, 10 May 2024 S2. Every wording below, oldest first.

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  1. Question 1

    9 May 2023 S2

    145
    In a certain culture of bacteria, the rate of increase is proportional to the number present. If there are 10410^4 at the end of 3 hours and 4⋅1044\cdot10^4 at the end of 5 hours, then there were _____ in the beginning.

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  2. Question 2

    10 May 2024 S2

    144
    In a certain culture of bacteria, the rate of increase is proportional to the number of bacteria present at that instant. It is found that there are 10,000 bacteria at the end of 3 hours and 40,000 bacteria at the end of 5 hours, then the number of bacteria present in the beginning are

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