What is 89 Fahrenheit in Celsius?
This should be in the Physics section but anyway...
For this, you need to know the formula that converts Fahrenheit to Celsius.
Googling it, you will easily find that:
I'm sure most people would pull out their calculator at this stage, but we could simplify it a bit more, if one notices that
Then we can simplify the 3 (because
You could bust out your calculator at this point but we could go a bit further, if one notices that