Respuesta :
answer:
3
step-by-step explanation:
- list out the factors for both
- 15: 1, 3, 5, 15
- 27: 1, 3, 9, 27
- the greatest common factor would be 3 since they both have 3 as a factor and it is the greatest among all the other common factors
answer:
3
step-by-step explanation: