Respuesta :
Answer:
9
Step-by-step explanation:
Factors of 18 are: 1, 2, 3, 6, 9, 18
Factors of 27 are: 1, 3, 9, 27
Answer 9 because there are 3 common factors of 18 and 27, that are 1, 3, and 9. Therefore, the greatest common factor of 18 and 27 is 9.