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Option one: 5/6 = 15/18
This is a proportion because when we cross multiply, we get 5 * 18 = 6 * 15, which simplifies to 90 = 90.
Option two: 5/6 = 20/18
This is not a proportion because when we cross multiply, we get 5 * 18 = 6 * 20, which simplifies to 90 = 120.