2 12/28 : 1 17/18 =

Convert mixed numbers to improper fractions: 2 12/28 = 68/28, 1 17/18 = 35/18. Divide the fractions: (68/28) / (35/18) = (68/28) * (18/35) = (68 * 18) / (28 * 35) = 1224 / 980. Simplify the fraction: 1224/980 = 153/122.5 (This is not a proper fraction, let's recheck). Simplify: 1224/980 = 153/122.5. Let's simplify 68/28 to 17/7 and 18/35. (17/7) * (18/35) = 306/245. The answer is 306/245.