5 and 2/3
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First we convert them into similar units, giving us 10 fifteenths and 12 fifteenths. Together that is 22 fifteenths or 1 and 7 fifteenths.
One-third is the same as five-fifteenths. Two-fifths is the same as six-fifteenths. Five-fifteenths plus six-fifteenths is eleven-fifteenths. One, or fifteen-fifteenths, minus eleven-fifteenths is four-fifteenths.
four fifths
three fifteenths
Three and four-fifths