4 = 2/4u
Multiply both sides by 4u
16u = 2
Divide both sides by 16, and simplify.
u = 1/8
72 = 2 * 2* 2 * 3 * 3
120 = 2 * 2 * 2 * 3 * 5
The greatest common factor (GCF) would be gotten from the factors common to both 72 and 120.
The common = 2 * 2 * 2 = 8
The GCF = 8
