Question 1185282
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An amoeba population triples every 10 minutes. If A Petri dish is completely filled after 7 hours. 
How long did it take for the Petri dish to be a third filled. 
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<pre>
It is a joke problem, because the answer becomes OBVIOUS if to think a minute.


It takes 10 minutes less than 7 hours for the Petri dish to be a third filled.


<U>ANSWER</U>.  It takes 6 hours and 50 minutes.
</pre>

Solved and explained.



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