Add the integer part first: 7 + 5. Then, add the fraction separately. For this, you'll have to find a common denominator, and convert the fractions to this common denominator.
who the hell knows
15 and two thirds plus four fifths = one two fiftenth
Thirteen fifths
The sum of 2 2/3 and 4/5 is 3 7/15.
too hard
twelve fifteenths or four fifths
Sixty-seven and eight fifteenths
1 21/30
1 1/15th or 16/15th
12 7/15
1 and 4/15ths
13 and 7/15