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The bacteria in a jar triple every 20 seconds. After three minutes, there are 275,562 bacteria in the jar. How many were in the jar at the beginning of the experiment?

 Mar 12, 2021
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We  have    9  time periods of 20 seconds  in  3 minutes

 

So

 

275,562  =    A (3)^9      where A  is the  beginning  number

 

275,562  / 3^9  =  A   =   14

 

 

cool cool cool

 Mar 12, 2021

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