100 / 5 = 20 years
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One fifth plus one fifth is two fifths (2/5).
one fifth
one and one-fifth
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.
One fifth of 325 = 65