Advanced MathVery hardQuantity halving every six hours
Advanced Math practice question
The amount of a substance halves every 6 hours. If there are 800 milligrams at the start, how many milligrams remain after 24 hours?
Answer: 50
24 hours is 4 halving periods, so 800 × (1/2)⁴ = 50.
Common wrong answers
- If you answered 100
- 100 halves only three times.
- If you answered 200
- 200 halves twice.
- If you answered 400
- 400 halves only once.
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