In the context of choosing a "whole", explain when a "fifth" is not always equal to a "fifth".
When choosing a "whole", a "fifth" will only be equal to 1/5 if the "whole" is equal to one. Otherwise, a "fifth" of the whole will have a different value from 1/5. For example, if there are 20 girls in a class, 20 represents the "whole", which means 4 is a "fifth" of the "whole"
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