You have 1 ml of kombucha. You remove 0.1 ml of this and mix it with 9.9 ml of fresh tea. You mix the second tube, then remove 1 ml of this mixture and add it to 9 ml of fresh tea. You then mix this, and remove 0.1 ml of this solution, and plate it. The next day, you return to find 362 colonies. What was the concentration of the cells in the original mix? Show your calculations

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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You have 1 ml of kombucha. You remove 0.1 ml of this and mix it with 9.9 ml of fresh tea. You mix the second tube, then remove 1 ml of this mixture and add it to 9 ml of fresh tea. You then mix this, and remove 0.1 ml of this solution, and plate it. The next day, you return to find 362 colonies. What was the concentration of the cells in the original mix? Show your calculations. 

My professor worked this problem out in class but she used a different method than that from the Khan academy videos on youtube and I am getting lost in the steps. Do you mind labeling? 

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