Answer is ten and eleven thirtieths. Found by making the denominators the same at thirty and then adding.
23/30
7 and 1 6th Seven and one sixth
seven and two fifths
14 and 3/5
11/30
11/15
seventeen and seven over twelve
the answer is 7 and one sixth
seven and nineteen twentieths (or 159/20)
7 and 2/3 + 8 and 5/6
seven-tenths
well three-sixth-two-sixth is one-sixth