Find the next two numbers

Question

6,12,9,18, 15 ___ ____

Answer 1

6,12,9,18,15,30,60

6 x 2 = 12
9 x 2 = 18
15 x 2 = 30
30 x 2 = 60

Answer 2

6,12,9,18, 15, 30, 27, 54

Chelle forgot to subtract 3 from every other number.

Answer 3

6
12 = 6*2
9 = 12 - 3
18= 9*2
15 = 18 -3
30 = 15*2
27 = 30 - 3

so I say 30 then 27

Answer 4

Thanks, Ms. Sue!
Now I see!