Final answer:
Jack and Sarah's recipe requires a ratio of 1.6 cups of pancake mix per cup of milk, which is answer (A).
Step-by-step explanation:
To find out how many cups of pancake mix is used per cup of milk in the given recipe, you simply divide the number of cups of pancake mix by the number of cups of milk. According to the recipe Jack and Sarah are using, they need 4 cups of pancake mix and 2.5 cups of milk. So, to calculate the ratio of pancake mix to milk, you perform the following division:
4 cups of pancake mix ÷ 2.5 cups of milk = 1.6 cups of pancake mix per cup of milk.
The answer is (A) 1.6 cups of pancake mix per cup of milk.