20f

This is the conversion formula for Fahrenheit to Celsius, where TF is temperature in Fahrenheit and TC is temperature in Celsius.

TC=59⋅(TF-32)

Substitute the Fahrenheit temperature into the formula.

TF=59⋅(20-32)

Subtract 32 from 20.

Tc=59⋅-12

Factor 3 out of 9.

Tc=53(3)⋅-12

Factor 3 out of -12.

Tc=53⋅3⋅(3⋅-4)

Cancel the common factor.

Tc=53⋅3⋅(3⋅-4)

Rewrite the expression.

Tc=53⋅-4

Tc=53⋅-4

Combine 53 and -4.

Tc=5⋅-43

Multiply 5 by -4.

Tc=-203

Move the negative in front of the fraction.

Tc=-203

Tc=-203

Convert the fraction to a decimal by dividing the numerator by the denominator.

Tc=-6.6‾

Convert to Celsius 20f