Advanced MathEasy–MediumDoubling repeatedly
Advanced Math practice question
A single bacterium culture starts with 20 cells and doubles in number every hour. How many cells are there after 4 hours?
Answer: 320
20 × 2⁴ = 20 × 16 = 320.
Common wrong answers
- If you answered 80
- 80 multiplies 20 by 4 (linear, not doubling).
- If you answered 160
- 160 is after 3 hours.
- If you answered 640
- 640 is after 5 hours.
More Advanced Math questions
- Easy–Medium
If f(x) = 2x² − 3, what is f(4)? - Easy–Medium
Which expression is equivalent to (2x³)(3x⁴)? - Easy–Medium
What are the solutions to x² − 16 = 0? - Easy–Medium
Which expression is equivalent to (x + 5)²? - Easy–Medium
For x ≠ 0, which expression is equivalent to (x² + 3x) / x? - Easy–Medium
What are the solutions to the equation 2(x − 3)² − 32 = 0 ?
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