11/21 is.
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The ratio of 63 to 33 can be calculated by dividing 63 by 33, which equals approximately 1.91. This means that for every 33 units, there are approximately 63 units, resulting in a ratio of 63:33 or simplified to 21:11.
54/63 = 6/7 simplified
63/64 cannot be simplified further.
6/63 = 2/21 simplified
45/63 is 5/7 simplified