SOLUTION: EColi culture doubles every 40 minutes. If 30 EColi are present initially, what will the number of EColi be after 3 hours?

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: EColi culture doubles every 40 minutes. If 30 EColi are present initially, what will the number of EColi be after 3 hours?      Log On

3 hours = 180 minutes = 4.5  40-minutes doubling periods.


So, after 3 hours, the number of EColi will be


     = 678.82 = 679  (rounded).    ANSWER