30
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The highest common factor (HCF) of 15, 60, and 90 is 15. To find the HCF, you need to identify the common factors of the numbers and then determine the highest one they share. In this case, the common factors of 15, 60, and 90 are 1, 3, and 15. Since 15 is the highest common factor, it is the HCF of the given numbers.
The GCF is 30.
Answer is 90
The GCF is 90.
The GCF is 15.