I believe there were 3 to start. It doubles every 12 hours and there are 48 to end. Also There are 48 hours in two days and I takes 12*4 to get 48. You would divide 48 (end bacteria number) by 2 to get 24. That’s the total for 36hrs. Then, do 36/2=12. That’s the total for 24hrs. Next, do 12/2 to get 6. That’s the total for 12hrs. Last, do 6/2=3. That’s your starting number. I hope this makes sense and helps.
