It is: 2 to 3
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If you mean: 8 12 16 and 10 15 20 then it is 4 to 5
1 shape cannot have a scale factor. A scale factor is something (a factor) that relates one shape to another.
A scale Factor is Algbrea so you have to... x - + and/or divided.
A scale factor is a number which scales, or multiplies, some quantity. A scale factor of two would mean to multiply whatever it is by two.
The scale factor of a scale drawing is the ratio of any length in the drawing to the true corresponding length in the "real" object.