It takes 22 minutes for a certain bacteria population to triple. At 8:00 am, the bacteria count was 3,000,000. What is the best estimate (in millions of units) of the population at 9:06 am on the same morning.

Question

tkhunny · Answer

How many time periods of 22 minutes have passed?

anonymous · Answer

I don't know

tkhunny · Answer

NonResponsive.

Start at 8:00 AM and end at 9:06 AM. You CAN answer my question.

anonymous · Answer

3 times (i think)

tkhunny · Answer

Think or know.  You have to be sure.  Prove it.  Show how you did it.

anonymous · Answer

I know because 22*3=66 minutes and that= 1hour and 6 minutes

tkhunny · Answer

That's better.

Let's try a simple example.  If you start with 2 things, what happens when we TRIPLE it three times?

anonymous · Answer

it=18

anonymous · Answer

yes i agree

tkhunny · Answer

Sorry, I fixed a typo.

2*3 = 6
6*3 = 18
18*3 = 54

You tripled it only twice. Agreed?

tkhunny · Answer

Okay, now to your problem.  You have 3 things.  Triple it three times.  What do you get?

anonymous · Answer

ohh so it would be 27,000,000

tkhunny · Answer

No.  That was only twice.

3*3 = 9
9*3 = 27
27*3 = 81

Something in your head gets so excited at 2 that you forget to do #3!!

Good work (except for counting).  :-)

anonymous · Answer

3

anonymous · Answer

!!