a) 9 5 4 / 20 8 15 = 180
b) 4 / 9 : 7 / 10 : 8 / 3 = (4 / 9) (10 / 7) (3 / 8) = 0.17857
c) 9 / 10 5 / 33 : 9 / 16 = (9 / 10) (5 / 33) * (16 / 9) = 0.30303
a) 9 5 4 / 20 8 15 = 180
b) 4 / 9 : 7 / 10 : 8 / 3 = (4 / 9) (10 / 7) (3 / 8) = 0.17857
c) 9 / 10 5 / 33 : 9 / 16 = (9 / 10) (5 / 33) * (16 / 9) = 0.30303