If the ratio between two numbers is 5 : 9, if 8 is subtracted from each, then the ratio become 1 ∶ 2, then the smallest number is
1
45
2
40
3
20
4
25
If the ratio between two numbers is 5 : 9, if 8 is subtracted from each, then the ratio become 1 ∶ 2, then the smallest number is