What time will the dish be full?


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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    The dish will be full at 12:44.

    Answer for old wording:
    The saucer was half full at 11.59 – the next minute there will be twice as many of them there (so full at 12.00).

    anikam Expert Answered on 24th August 2015.
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