1 4/8 : 1 20/32 =

Convert mixed numbers to improper fractions: 1 4/8 = 12/8, 1 20/32 = 52/32. Divide the fractions: (12/8) / (52/32) = (12/8) * (32/52) = (12 * 32) / (8 * 52) = 384 / 416. Simplify the fraction: 384/416 = 3/4. The answer is 3/4.