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  •  » Science: A bacteria doubles its population every 12 hours.

#1 2012-11-16 18:53:41

cat1kf2
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Science: A bacteria doubles its population every 12 hours.

After 3 days, there are 1,600 bacteria. How many bacteria were there at the beginning of the first day? Use the work backward strategy.roflol

#2 2012-11-16 19:07:22

bob bundy
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Re: Science: A bacteria doubles its population every 12 hours.

hi cat1kf2

Welcome to the forum.

Work backwards:

After 3 days ....................1600

12 hours earlier................   1600 2

after two days ..................  2 again

12 hours earlier ................  2 again

After one day ...................    2 again

12 hours ealier .................    2 again

start ................................  2 again

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#3 2012-11-18 19:54:49

SMBoy
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Re: Science: A bacteria doubles its population every 12 hours.

Is The Answer above correct? as there is no reply?

#4 2012-11-18 19:59:11

bob bundy
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Re: Science: A bacteria doubles its population every 12 hours.

hi SMboy,

Welcome to the forum.

What answer are you talking about ?

I gave a method, but deliberately did not say what I thought the answer is.

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#5 2012-11-19 11:37:52

Ms_Zee
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Re: Science: A bacteria doubles its population every 12 hours.

Hi SMboy,
The explanation you received from bob bundy is correct, you just need to work out the result.

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#6 2012-11-19 12:46:26

mathgogocart
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Re: Science: A bacteria doubles its population every 12 hours.

according to bob bundy(thank you)
the Awser is 25


Hey.

#7 2012-11-19 22:00:55

SMBoy
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Re: Science: A bacteria doubles its population every 12 hours.

Thank's all I understand now how it works.

#8 2012-11-22 15:30:00

cat1kf2
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Re: Science: A bacteria doubles its population every 12 hours.

bob bundy wrote:

hi cat1kf2

Welcome to the forum.

Work backwards:

After 3 days ....................1600

12 hours earlier................   1600 2

after two days ..................  2 again

12 hours earlier ................  2 again

After one day ...................    2 again

12 hours ealier .................    2 again

start ................................  2 again

Bob

Thanks for your help Bob

#9 2012-11-22 15:38:55

cat1kf2
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Re: Science: A bacteria doubles its population every 12 hours.

mathgogocart wrote:

according to bob bundy(thank you)
the Awser is 25

thanks for your help

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