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To find the number of bacteria at 8:00 a.m., we need to find how many times the culture doubles from 8:00 a.m. to 9:00 a.m.
Since the culture doubles every hour, from 8:00 a.m. to 9:00 a.m., which is a span of 1 hour, the culture double once.
Therefore, the equation that represents the number of bacteria, n, at 8:00 a.m. is:
n = 120 / 2
Simplifying the equation:
n = 60
So, there were 60 bacteria at 8:00 a.m.