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19 August, 01:08

In a favorable environment, bacteria can reproduce about every 20 minutes. There are four bacteria that is left out at room temperature. After two hours, how many bacteria

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  1. 19 August, 01:44
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    Every time they reproduce, their number doubles.

    There are 120 minutes in 2 hours.

    So, they reproduced 120/20=6 times.

    In the end, there are 4*2*2*2*2*2*2=256 bacteria.

    Here is a chart:

    After 0 hours and 0 min.:

    There are 4 bacteria

    After 0 hours and 20 min.:

    There are 8 bacteria

    After 0 hours and 40 min.:

    There are 16 bacteria

    After 1 hours and 0 min.:

    There are 32 bacteria

    After 1 hours and 20 min.:

    There are 64 bacteria

    After 1 hours and 40 min.:

    There are 128 bacteria

    After 2 hours and 0 min.:

    There are 256 bacteria
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