87 = (1, 3, 29, 87) 54 = (1, 2, 3, 6, 9, 18, 27, 54) 28 = (1, 2, 4, 7, 14, 28)
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87/54 = 29/18
87/54 = 29/18
28/54 x 100 = 51.851 recurring (that is, 51.851851851...) percent.
28 = 2 x 2 x 7, 54 = 2 x 3 x 3 x 3 so only common factor is 2
LCM of 28 and 54 is 756.