Free ACT Practice Question

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ID: ACT-M-139
Section: Math
Topics: Functions; Application of functions
Difficulty level: Challenging

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In a laboratory experiment, it was found that the number of bacteria triples every hour. The number of bacteria at the end of six hours was found to be $72900$. How many hours after the experiment started was the number of bacteria one-third of the final number of bacteria, $72900$?

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