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1/3rd
48 over 63 in its simplest form = 16 over 21
The simplest form is 1/21
63/69 = 21/23
30/63 = 10/21
21/56
It is: 48/63 = 16/21
4/21
2/21
5/21
21/20
63/78 = .807 or 21/26