Let x equal the number of purple trays. The fraction of trays that are purple will be x/20
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The answer depends on how many colours there are and how many of them are different shades of purple.
11 over 20 = 11/20 in fraction
9 over 20:= 9/20 in fraction
20/100 = 1/5
16 20 equal to in fraction = 16/20 or 4/5