90
63 divided by 7 equals nine.
600 divided by 60 equals 10.
-45
72
One. Because any number divided by itself equals one.
10
54 divided by 6 is 9.
1800
Fifteen is to five as nine is to three, because 15 divided by 3 equals 5, and 9 divided by 3 equals 3.
10
3