Answer:
The GCF is 5
Step-by-step explanation:
You want to find the multiples of each number.
Disclaimer: Y^2 or Y doesn't count in finding the greatest common factor
Multiples of 15y^2 and 15 (they are the same number since y^2 doesn't help you find the gcf so number just 15): 1, 2, 5, 10
Multiples of 10y (number just 10): 1, 3, 5, 15
