To find the amount of flour in the changed recipe, we know that Kendra is using 2 1/2 cups of flour and sugar combined. The original recipe calls for 2 cups of sugar, so we need to subtract the sugar amount from the total amount of flour and sugar in Kendra's recipe.
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Convert 2 1/2 cups to an improper fraction: \[ 2 \frac{1}{2} = \frac{5}{2} \text{ cups} \]
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Now, subtract the sugar from this combined amount: \[ \text{Total (flour + sugar)} - \text{Sugar} = \text{Flour} \] \[ \frac{5}{2} - 2 = \frac{5}{2} - \frac{4}{2} = \frac{1}{2} \text{ cups of flour} \]
Therefore, the amount of flour used in the recipe is 1/2 cup.