What temperature has the same degrees in Celsius and Fahrenheit?

Idle question of the day: What temperature has the same degrees in Celsius and Fahrenheit?

Converting from Fahrenheit to Celsius

Formula:

C = (F–32) · (5/9)

Approximate version (to do in your head):

C = (F–30) / 2

Converting from Celsius to Fahrenheit

F = C·9/5 + 32

Approximately:

F = C·2 + 30

The same degrees in both systems?

To get the answer, you have to solve the following equation:

x = (x–32) · (5/9)

The answer is x = –40. Thus: –40°C is the same temperature as –40°F. Most of us can thus agree that that’s very cold.