Multiple choice

At what temperature are Celsius and Fahrenheit equal?

  1. What? Not at any temperature!

  2. 13°C and 13°F

  3. -40 °C and -40 °F.

  4. 20°C and 20°F

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The formula to convert Celsius to Fahrenheit is F = (C * 9/5) + 32. Setting F = C and solving gives -40 = -40.