In order to compare the two temperatures, we need to convert 20°F into Celsius. The formula we need to use is:
[tex] T(^{\circ}C)=\frac{5}{9}(T(^{\circ}F)-32) [/tex]
Substituting 20°F, we find
[tex] T(^{\circ}C)=\frac{5}{9}(20^{\circ}F-32) =-6.7^{\circ}C [/tex]
And this is less than 0°C, so the answer is
20°F is colder than 0°C.