5
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The GCF/HCF of 85 and 185 is 5.
3.
The HCF of 30 and 105 is 15.
The GCF is 3.
It is not possible to give a sensible answer to this question. The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!