In its simplest form.... 7/11
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77 over 21 = 11/377 ÷ 7 = 1121 ÷ 7 = 3
21/77 in simplest form is 3/11, because both 21 and 77 are divisible by 7.
For the fraction 77/90, the equivalent percentage = 85.56%
11/77 = 1/7
It is: 77/140 = 11/20