Respuesta :
First find the factors of 15:
1, 3, 5, 15
Next find the factors of 45:
1, 3, 5, 9, 15, 45
Then, find the factors of 90:
1,3,5,6,9,10, 15, 18, 30, 45
Lastly, find the factors that are the same in all of the numbers:
1,3,5, 15
1, 3, 5, 15
Next find the factors of 45:
1, 3, 5, 9, 15, 45
Then, find the factors of 90:
1,3,5,6,9,10, 15, 18, 30, 45
Lastly, find the factors that are the same in all of the numbers:
1,3,5, 15