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To find the scale factor, we can use the ratio of the corresponding side lengths of the two squares.
The given square has a side length of 60 units, and the desired square has a side length of 18 units.
Using the formula for scale factor:
Scale factor = Desired side length / Given side length
Scale factor = 18 / 60
Scale factor = 0.3
Therefore, the scale factor to dilate the square from a side length of 60 units to a side length of 18 units is 0.3 or 3/10.