The number of cups of sugar in the recipe is 2/3 (0.67) times the number of cups of oats (because for every 2 cups of sugar, there are 3 cups of oats).
The number of cups of oats in the recipe is 3/2 (1.5) times the number of cups of sugar (because for every 3 cups of oats, there are 2 cups of sugar).