Answer:
Your answer would be 9.
Explanation:
12*12=144
15*15*15=3375
The factors of 144 are: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144
The factors of 3375 are: 1, 3, 5, 9, 15, 25, 27, 45, 75, 125, 135, 225, 375, 675, 1125, 3375
So the greatest common factor would be 9 since is the largest number that is the same for both of the numbers.