Bacteria? Yuk!

A Petri dish hosts a healthy colony of bacteria. Once a minute every bacterium divides into two. The colony was founded by a single cell at noon. At exactly 12:43 (43 minutes later) the Petri dish was half full.
At what time will the dish be full?

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November 19th, 2009 | Category: Mathematical |  Email This Riddle

6 guesses to Bacteria? Yuk!

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• Chris

  November 19, 2009 at 1:03 AM

  12:44

• Dude

  November 19, 2009 at 9:16 PM

  Congratulations Chris, you’re correct. If they’re doubling every minute and the dish is half full, in one more minute it will be full.

  You are today’s winner!

• ???? rb3183

  September 9, 2013 at 7:19 PM

  ????? ??

• Aria

  July 6, 2015 at 10:01 AM

  12:44

• North

  January 28, 2018 at 7:27 AM

  But i have a question
  How can u actually solve this via a formula
  A mathematical solution
  Pls answer im curious

• Bob

  November 18, 2019 at 7:02 AM

  1:34