kristina95
6, 12, 9, 18, 15
a.
45
c.
12
b.
23
d.
30



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kristina95
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make a conjecture about the next number in the sequence

Butterfly16
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Well you can see that 6*2=12, and then 123=9
And you can see that 9*2=18, and 183=15
So, what is 15*2?

kristina95
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30

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

Butterfly16
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Yup, so 30 would be your next number. :o) Good job!

kristina95
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thanks! @Butterfly16