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#1 Re: Help Me ! » Science: A bacteria doubles its population every 12 hours. » 2012-11-21 16:38:55

mathgogocart wrote:

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

thanks for your help

#2 Re: Help Me ! » Science: A bacteria doubles its population every 12 hours. » 2012-11-21 16:30:00

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

#3 Help Me ! » Science: A bacteria doubles its population every 12 hours. » 2012-11-15 19:53:41

cat1kf2
Replies: 8

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

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