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Biology Riddle

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1 Biology Riddle on Thu Jan 21, 2010 12:59 am

hazzmta

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A scientist is experimenting with bacteria that are one micron in diameter and that reproduce by dividing every minute into two bacteria. At 9:00 PM, she puts a single organism in a container. At precisely 10:00 PM, the container is full.

At what time was the container half full?

cyclops

2 Re: Biology Riddle on Thu Jan 21, 2010 1:13 am

vicster

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9:30 pm? Is this a trick question?

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3 Re: Biology Riddle on Thu Jan 21, 2010 1:19 am

hazzmta

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vicster wrote:9:30 pm? Is this a trick question?

9:30 PM is incorrect. it's not really a trick question... think back to calculus.

4 Re: Biology Riddle on Thu Jan 21, 2010 1:22 am

vicster

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I'd rather not.

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5 Re: Biology Riddle on Thu Jan 21, 2010 2:45 pm

EccentricPhilosopher

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I think I can get this, I just can't get my math working right now.

6 Re: Biology Riddle on Thu Feb 18, 2010 12:13 pm

hermit


How about 9:59?

7 Re: Biology Riddle on Thu Feb 18, 2010 10:30 pm

vicster

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Who is hermit??

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8 Re: Biology Riddle on Thu Feb 18, 2010 11:23 pm

EccentricPhilosopher

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Dennis.

9 Re: Biology Riddle on Fri Feb 19, 2010 10:40 am

vicster

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Hi, Dennis! Welcome to the board!

http://www.theknot.com/ourwedding/VictoriaClark&ToddAycock

10 Re: Biology Riddle on Fri Feb 19, 2010 3:10 pm

hermit


Hi Vic,
I noticed that you do not want to revisit calculus to solve the problem. I don't remember ever taking calculus so I don't know how horrible it might be.

11 Re: Biology Riddle on Sat Feb 20, 2010 5:18 pm

victster


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It's pretty awful. You're lucky if you never had to take it!

12 Re: Biology Riddle on Sun Feb 21, 2010 7:19 pm

EccentricPhilosopher

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vicster, for some reason, it's thinking your a guest. Make sure you're logged in.

13 Re: Biology Riddle on Mon Feb 22, 2010 6:27 pm

hazzmta

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9:59 is the correct answer. every minute, they double. so half of the final amount is the amount before the final "double"-ing.

14 Re: Biology Riddle on Thu Feb 25, 2010 11:23 pm

EccentricPhilosopher

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OH! That makes sense. I was thinking too hard, and trying to figure out what the capacity would be (2 to the 60th power) and what half that is in exponential form to figure out the minutes. Good one.

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