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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10-05-2020
Biology

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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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salatulmaghrib salatulmaghrib · Answer 1 · 2020-05-10T00:57:20+02:00

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