A culture of 300 bacteria doubles every 5 hours. How many bacteria are there after 15 hours?

Answer and explanation

Correct answer: C. 2400

  1. Step 1: The number of doublings is 15 / 5 = 3.
  2. Step 2: N = 300 x 2^3 = 2400.
Answer
2400.
Why not the others: '1800' multiplies by 2n instead of 2^n; '1200' applies one doubling too few; '4800' applies one doubling too many.

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