1/5+2/15,4/9+5/6,15/8-6/12,4 7/15 3 1/6

1/5 + 2/15 = 3/15 + 2/15 = 5/15 = 1/3, 4/9 + 5/6 = 8/18 + 15/18 = 23/18 = 1 5/8, 1 5/8 - 6/12 = 13/8 - 6/12 = 39/24 - 12/24 = 27/24 = 1 3/24 = 1 1/8, 4 7/15 - 3 1/6 = 67/15 - 19/6 = 134/30 - 95/30 = 39/30 = 1 9/30 = 1 3/10.