5/9 = 25/45 but not to 15/28
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8/9 × 15/28 × 21/25 = (8×15×21)/(9×28×25) = 2520/6300 = (2×1260)/(5×1260) = 2/5
14 over 15
28/50
15/28 is the simplest form and, by definition, the simplest form must be equivalent to other forms of the ratio.
41/7 - 25/28 = 164/28 - 25/28 = 139/28 = 427/28