Which equation calculates the number of 1313-cup servings you can make with 4 cups of pudding?

a. 4 : 1313 = 12

b. 4 : 1313 = 112112

c. 1313 : 4 = 112112

d. 1313 : 4 = 12

D is the correct answer partly because it's the only equation that has the correct outcome and partly because you have to divide 1313 by 4 anyways for the answer to make sense.

number of cups you have : number of cups per serving = number of servings

D. 1313 divide by 4 equals 12