AlgebraVery hardWhere two temperature scales agree
Algebra practice question
The Fahrenheit temperature F and the Celsius temperature C are related by F = 1.8C + 32. At what temperature are the two readings numerically equal?
Answer: -40
Set F = C: C = 1.8C + 32 gives −0.8C = 32, so C = −40.
Common wrong answers
- If you answered 0
- At 0°C the Fahrenheit reading is 32.
- If you answered 32
- 32 is F when C = 0.
- If you answered 40
- 40 has the sign wrong.
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