If by four sixth you mean 4/6, the answer would be 8/6 or 1 and 2/6.
4/6 or 2/3
4/3
4/9.
6 and 2/6 or 6 and 1/3
1/6 + 3/6 = 4/6 = 2/3
It is: 10
It is 19/15 = 1 4/15.
4 and 1 sixth
2/4 + 3/6 = 1
4 and 3/6
It is 4 and 5/6.
(2/3) + (1/6) + (1/6) = (4/6) + (1/6) + (1/6) = (6/6) = 1