Final answer:
Jackie needs an additional 16 cups of sugar.
Step-by-step explanation:
To find the number of additional cups of sugar Jackie needs to bake a total of 48 pies, we can set up a proportion. Since she can bake 3 pies with each additional cup of sugar, we have:
3 pies / 1 cup = 48 pies / x cups
Next, we can solve for x by cross-multiplying:
3x = 48
x = 48 / 3
x = 16 cups
Therefore, Jackie needs an additional 16 cups of sugar.