Question 314579
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20 minutes is the same thing as *[tex \Large \frac{1}{3}] hour.  So at time *[tex \Large \frac{5}{3}] hour, the bacteria has doubled 5 times.  Doubling 5 times is the same thing as multiplying by *[tex \Large 2^5\ =\ 32].  Divide the ending amount by 32.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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