The scale factor between the 2 values is 36/18 = 6/3 = 2(but the dilation from 36 to 18, specifically, is 1/2, since 18/36 = 1/2).
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The common factors of 18 and 36 are 18,9,6,3,2,1.
GCF(36, 54, 72) = 18.
36 and 54's highest common factor is 18.
Since 18 is a factor of 36, it is automatically the GCF of this problem.
The GCF is 18.