Final answer:
The amount of flour (in cups) in the original recipe is 2.5 cups.
Step-by-step explanation:
To find the amount of flour (in cups) in the original recipe, we need to set up a proportion. The changed recipe calls for 2 1/2 cups of flour and sugar combined, and the original recipe calls for 2 cups of sugar. Let x be the amount of flour (in cups) in the original recipe. We can set up the proportion as follows:
2 cups/2 1/2 cups = x cups/2 cups
Cross multiplying, we get 2(x) = (2 1/2)(2), which simplifies to 2x = 5. Solving for x, we find that x = 5/2 = 2.5 cups.