It is: 3/10
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1/5 + 1/10= 3/10
One tenth
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.
Twice as many as in a tenth