12, 16.5, 25.5, 39, 57, ?
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Answer:
79.5
Step-by-step explanation:
There is a difference of multiples of 4.5
12+4.5=16.5
16.5+9.0=25.5
25.5+13.5=39
39+18.0=57
57+22.5=79.5
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