Respuesta :

3, 5, 15, are common factors of 15, 45 and 90

15/3 = 5
45/3 = 15
90/3 = 30

15/5 = 3
45/5 = 9
90/5 = 18

15/15 = 1
45/15 = 3
90/15 = 6

hope this helps
15= 1,3,5,15
45= 1,3,5,9,15,45
90= 1,2,3,5,6,9,10,15,18,30,45,90

Hope this helps!