Hmmm... a geometric sequence MUST have a fixed common ratio. If it is changing, then the sequence you are looking at might not be a geometric sequence at all. We'd need to see an example to be sure.
55/100 = (55:5)/(100:5) = 11/20
55/100 = 0.55
Answer:
Divided by 3.
They are all divided by 3.
