Advanced MathEasy–MediumValue after a fixed number of tripling periods
Advanced Math practice question
The number of bacteria in a dish triples every 4 hours. If there are 200 bacteria at noon, how many are there at 8 p.m. the same day?
Answer: 1800
8 hours is two tripling periods: 200 × 3² = 200 × 9 = 1,800.
Common wrong answers
- If you answered 600
- 600 is after one tripling (4 p.m.).
- If you answered 1200
- 1,200 adds 200 × 3 twice, treating the growth as linear.
- If you answered 5400
- 5,400 is after three triplings (midnight).
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