1 9/35 : ( 1 1/5 + 2/3) = 44/35 : (6/5 + 2/3)
6/5 + 2/3 = (18 + 10)/15 = 28/15
44/35 : 28/15 = (44*15) / (35*28) = 33/49
(11 5/8 + 7 1/6) : 3 5/12 = (93/8 + 43/6) : 41/12
93/8 + 43/6 = (279 + 172) / 24 = 451/24
451/24 : 41/12 = (451*12) / 24*41) = 11/2 = 5 1/2