Advanced MathEasy–MediumDoubling three times
Advanced Math practice question
A colony of bacteria doubles in size every hour. If the colony has 100 bacteria at noon, how many bacteria will it have at 3 pm?
Answer: 800
Three doublings: 100 × 2 × 2 × 2 = 800.
Common wrong answers
- If you answered 300
- 300 adds 100 each hour.
- If you answered 400
- 400 doubles only twice.
- If you answered 600
- 600 adds 200 three times.
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