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21 over 27 is the same as 21 divided by 27:21/27 = 21 ÷ 27 = 0.777778
They are: 14/18 and 21/27
14/18, 21/27, etc.
it is that this website does not have estimating with percents STUPID webste.
63/81 = 21/27 = 7/9