It is: 1/5+3/7 = 22/35
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24/35
One fifth plus one fifth is two fifths (2/5).
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.
0.05714285714 or 2/35.
One fifth PLUS two fifths = 3 fifths