The GCF is 4.
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The GCF is: 4
The GCF of those numbers is 4. If 20 disappeared, the GCF of the remaining numbers would be 8.
The GCF of 20 and 32 is 4, allowing you to simplify to 5/8
4
8/20 = 2/5 (You divide the numerator and the denominator by the GCF, which in this situation is 4)