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 12 noon.
At exactly 12:43 (43 minutes later) the Petri dish was half full.
At what time will the dish be full?
Last updated on 1 January 2012
Copyright: R J Moore 2008-2012 all rights reserved.