Answer:4/3
Step-by-step explanation:start by converting the mixed numbers to improper fractions to make the subtraction easier:
5⅔ cups of cereal = 17/3 cups of cereal
4⅓ cups of marshmallows = 13/3 cups of marshmallows
Now subtract the amount of marshmal ows from the amount of cereal: 4/3 of a cup