the matinez family purchesed a box of Frosty puffs cereal as shown below. how many 3/4 cups servings of cereal can be made from the box of cereal?

Divide 11 1/4 cups by (3/4)(cups/serving):
45 cups 4 servings
------------- * ------------------ = 15 servings (answer).
4 3 cups
Note that division by 3/4 is equivalent to multiplication by 4/3. This is what I did, above.