AlgebraEasyHeight of a burning candle
Algebra practice question
A candle is 24 centimetres tall and burns down at a constant 3 centimetres per hour. How tall, in centimetres, is the candle after 5 hours?
Answer: 9
Height = 24 − 3 × 5 = 24 − 15 = 9.
Common wrong answers
- If you answered 15
- 15 is the amount burned, not the height remaining.
- If you answered 21
- 21 is 24 − 3, one hour's burning only.
- If you answered 39
- 39 adds the 15 instead of subtracting it; the candle gets shorter.
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