Answer :

24: 1, 2, 3, 4, 6, 8, 12, 24
120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120

The GCF of 24 and 120 is 24.

[tex] 24:120 / 24:24 = \\ 1:5 [/tex]
[tex]24:120=\frac{24}{120}=\frac{24:4}{120:4}=\frac{6}{30}=\frac{6:6}{30:6}=\frac{1}{5}=1:5\\\\Answer:\boxed{24:120=1:5}[/tex]