At what temperature are Celsius and Fahrenheit equal?

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A -40
B -42
C -37
D -45

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Answer: A. -40

Use F = C x 9/5 + 32. Setting F = C gives C = 9C/5 + 32, so -4C/5 = 32 and C = -40. So -40 degrees Celsius equals -40 degrees Fahrenheit.

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At what temperature are Celsius and Fahrenheit equal?

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