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The population of a bacteria culture doubles every 2 minutes

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The population of a bacteria culture doubles every 2 minutes [#permalink] New post 13 Mar 2008, 19:39
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E

Difficulty:

  35% (medium)

Question Stats:

61% (01:46) correct 38% (01:13) wrong based on 42 sessions
The population of a bacteria culture doubles every 2 minutes. Approximately how many minutes will it take for the population to grow from 1,000 to 500,000 bacteria

A. 10
B. 12
C. 14
D. 16
E. 18
[Reveal] Spoiler: OA

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Last edited by Bunuel on 12 Sep 2013, 01:24, edited 1 time in total.
Renamed the topic, edited the question, added the OA and moved to PS forum.
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Re: Population [#permalink] New post 13 Mar 2008, 21:42
Is not quite that.
min 0 - 1,000
min 2 - 2,000=1,000*2^1
min 4 - 4000=1000*2^2;
min 6 - 8000=1000*2^3

Be careful! It doubles every 2 minutes.

So, 1,000*2^x=500,000
2^x=500. It asks you to approx. You know that 2^9=512, so x=9.
Because the pop doubles every 2 minutes, the result=9*2=18 minutes.
OA?
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Re: The population of the bacteria culture doubles every 2 [#permalink] New post 11 Sep 2013, 17:13
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This one's easy.

1000 * 2^t = 500,000
2^t = 500
Now gauging, since 2^8 = 256, then 2^9 = 512
So t = 9

But be careful, 't' is in time intervals of two minutes

So answer is 9*2 = 18 minutes

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Re: The population of a bacteria culture doubles every 2 minutes [#permalink] New post 12 Sep 2013, 01:26
Expert's post
alimad wrote:
The population of a bacteria culture doubles every 2 minutes. Approximately how many minutes will it take for the population to grow from 1,000 to 500,000 bacteria

A. 10
B. 12
C. 14
D. 16
E. 18


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Re: The population of a bacteria culture doubles every 2 minutes   [#permalink] 12 Sep 2013, 01:26
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