By this question you need more information. Another number is needed. The GCF (greatest common factor) of 30 and 45 is 15. So please give more information!
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Common factors of 30 and 16 are: 1 and 2.
30
Common factors of 30, 75, and 150 are: 1, 3, 5, and 15.
The GCF is 12.
It is: 15