Which equation correctly converts Fahrenheit to Celsius?

• A. C = (F + 32) / 9
• B. F = 9/5 C + 32
• C. C = 5/9 (F - 32)
• D. F = 5/9 (C - 32)

Answer: (C)

Converting Fahrenheit to Celsius means removing the 32-degree offset between the two scales and then adjusting for the different size of each degree. Since water freezes at 32°F and 0°C, you subtract 32 from the Fahrenheit value and then multiply by 5/9 to convert the temperature difference into Celsius. This gives C = 5/9 (F − 32).

Other forms either mix up the order (subtracting the offset after a wrong operation), express the inverse relationship (F from C), or place the offset inside the wrong term, so they don’t correctly translate Fahrenheit values into Celsius.