11/30 is. Notice that this format is hinted at by the word "over".
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30/22 = 15/11 = 1 and 4/11
30 / 33 = (3 * 10) / (3 * 11) canceling the threes of the top and the bottom we get the fraction 10 / 11
21 over 11 = 21/11 in fraction
The proper fraction 10/11 is expressed in simplest form. Equivalent fractions of 10/11 include 20/22, 30/33, etc.
30 over 108 is a fraction. A fraction does not (cannot) have a GCF.