Answer:
3 in
Explanation:
Ⓗⓘ ⓣⓗⓔⓡⓔ
Well, in order to find scale factor, you'd do model/actual.
In all cases, unless stated otherwise, the first image is the actual.
So what we'd do is this:
18 in
6 in
18/6=3
Your scale factor is 3 inches!
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