A population of bacteria doubles every 30 minutes. Starting with 100 bacteria, how many will there be after 3 hours?
Answer and explanation
Correct answer: C. 6400
- Step 1: 3 hours = 6 half-hours, so 6 doublings.
- Step 2: .
Answer
6400.
Why not the others: 600: the doubling was treated as adding 100 each time. 3200: 5 doublings were used. 1200: the number of hours was multiplied by 400.
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