It is the same as 2 cm = 3 m or 1 cm = 1.5 m
The scale ratio would therefore be 150:1
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The lowest common factor of 12, 18 & 36 is 1.
the scale factor is 4.5 just divide the numbers 18/4 = 9/2 = 4.5 27/6 = 9/2 = 4.5
the highest common factor of the numbers 12, 16 and 18 is 2.
All the factor pairs of 18 satisfy this request.
6 - -12 = 18