9 and 2/5 is a dimensionless number, it is not an amount of weight. If you are talking about 9 and 2/5 pounds, or kilograms, or tons, or stone (etc.) then a conversion can be done to grams.
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1 9 25
9 and one fifths, 9 and two tenths, or 920%.
That'd be written as 9 2/5
9 39/40
The answer is: 5/10 + 2/5 = 9/10