24 2/35 - 18 5/14 - 5 3/10 = (24 - 18 - 5) + (2/35 - 5/14 - 3/10) = 1 + (4/70 - 25/70 - 21/70) = 1 + (4 - 25 - 21)/70 = 1 - 42/70 = 1 - 3/5 = 2/5.