Multiple choice general knowledge

It takes 30 days to fill a laboratory dish with bacteria. If the size of the bacteria doubles each day, how long did it take for the bacteria to fill one half of dish?

  1. 15

  2. 29

  3. 28

  4. 14

  5. 30
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since bacteria doubles each day, working backwards from day 30 (full dish), day 29 would have half the dish filled. This is because each day's growth is exactly double the previous day's amount.

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