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It is: 1 to 3 in simplest form
9/84 = 3/28
117
28/85
11/28
1 over 3
39/84 = 13/28
It is: 11/28
1/28
15/28
25/28
69/28
15/28 is the simplest form and, by definition, the simplest form must be equivalent to other forms of the ratio.