Respuesta :

Answer:

5

Step-by-step explanation:

factors of 15: 1, 3, 5, 15

factors of 40: 1, 2, 4, 5, 8, 10, 40

factors of 20: 1, 2, 4, 5, 10, 20

hope this helped:)

The answerr is 5 cuz 40 divided by 5 is 8 and 15 divided by 5 is 3 and 20 divided by 5 is 4