21/57 = 7/19
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The simplified fraction of 15/21 is 5/7.
7/18
= 21/50
21 over 40 is irreducible as a fraction expression. 21 over 40 is 0.525 as a decimal expression.
The fraction 21/23 cannot be simplified. You could muliply both of them by the same number, and get a fraction like 42/46, but it's better to keep fractions simplified.