5
The GCF of 15, 24, and 72 is 3. There is no GCF for 63, 20, and 50. This makes it relatively prime.
The GCF of (-15) and 50 = 1
The GCF is 5.
The GCF is 5.
The GCF of 30, 50, 20 is 10.
The GCF of 15 and 27 is 3. The GCF of 15, 20 and 25 is 5. The GCF of 15, 27, 15, 20 and 25 is 1.
The GCF is 10.
The GCF of 20 40 and 50 is 10.
The GCF is 5.
The GCF is 1.
The GCF is 5.
10 and 100, respectively.