Math Is Fun Forum
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#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.
Pages: 1