AlgebraEasyGreatest whole-number rise below a limit
Algebra practice question
The temperature in a greenhouse must stay below 30°C. It is currently 24°C. By at most how many whole degrees can the temperature rise and still stay below 30°C?
Answer: 5
24 + r < 30 gives r < 6, so the greatest whole number is 5.
Common wrong answers
- If you answered 6
- A rise of 6 reaches exactly 30, which is not below 30.
- If you answered 30
- 30 is the limit, not the rise.
- If you answered 54
- 54 adds the two temperatures.
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