- 27
- 30
- 35
- 40
- a
-
5,9,10,18,15,_____
Its double series.
5,10,15,20,25,_____
9,18,27,36,45,_____
5+5=10
9+9=18
10+5=15
18+9=27
5,9,10,18,15,_____
Its double series.
5,10,15,20,25,_____
9,18,27,36,45,_____
5+5=10
9+9=18
10+5=15
18+9=27