Question

6, 12, 9, 18, 15
a.
45
c.
12
b.
23
d.
30

Answer 1

make a conjecture about the next number in the sequence

Answer 2

Well you can see that 6*2=12, and then 12-3=9
And you can see that 9*2=18, and 18-3=15

So, what is 15*2?

Answer 3

30

Answer 4

Hint:
6, 12, 9, 18, 15, ?

Answer 5

Yup, so 30 would be your next number. :o) Good job!

Answer 6

thanks! @Butterfly16