A unit rate is a comparison of two quantities where one of the quantities is equal to one. In other words, a unit rate expresses how many units of one quantity are present for every one unit of another quantity.
Among the given options, the fraction that represents a unit rate is:
27/1 (which means 27 units of one quantity for every 1 unit of another quantity).
The other options do not represent a unit rate, as they do not simplify to a form where one of the measures is one unit.
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