Am assuming that you mean hcf? and that would be 10, as that is the highest factor that is common in all thee numbers
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The GCF is 10.
The GCF is 2.
The GCF of 30 and 20 is 10. The GCF of 40 and 20 is 20.
The greatest common factor of 20, 30, and 80 is 10.
the gcf is 10