6
It is 6
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The greatest common factor (GCF) of 20 and 30 is 10.
30 is a factor of 150 so 30 is the greatest common factor of 30 and 150
The greatest common factor of 7 and 30 is 1.
GCF of 12, 30, and 72 is 6
The GCF of 12, 15, 18, and 30 is 3.