Well, a fifth is one fifth of one, that's why it's called a fifth, it's divided into five. If your question was 'what is a fifth a tenth of?', then the answer would be two. What is a fifth a seventh of? 1.4, etc.
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A fifth of that something.A fifth of that something.A fifth of that something.A fifth of that something.
One fifth plus one fifth is two fifths (2/5).
one fifth
That depends what it is a fifth of.
five to the fifth