3) 2 5/6 + 1 3/10;

2 5/6 + 1 3/10 = 12/6 + 5/6 + 10/10 + 3/10 = 17/6 + 13/10 = 85/30 + 39/30 = 124/30 = 4 4/30 = 4 2/15.