Respuesta :

Answer: 9


Step-by-step explanation:

The factors of 18: 1, 2, 3, 6, 9, 18


The factors of 27: 1, 3, 9, 27



Factors of 18: 1, 2, 3, 6, 9, 18 .  

Factors of 27: 1, 3, 9, 27 .  

Common factors of 18 and 27: 1, 3, 9 .  

Greatest common factor: 9 .