At which temperature are the Fahrenheit and Celsius readings equal?

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• A -40
• B 45
• C 60
• D 50

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Answer: A. -40

F = (9/5)C + 32. Setting F = C gives C = (9/5)C + 32, so -(4/5)C = 32 and C = -40. So -40 deg C = -40 deg F.

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