Two ways to work this. 1) divide each of the given portions into 20 parts and add the resulting fractions. .. (1 2/3)/20 = 1/20 + (2/3)*(1/20) .. = 1/20 + 1/30 .. = 3/60 + 2/60 .. = 5/60 = 1/12
2) convert 1 2/3 to an improper fraction and divide by 20. .. (1 2/3)/20 = (5/3)*(1/20) .. = (5*1)/(3*20) .. = 5/60 = 1/12