Ty had 2 1/2 cups of oil and used 3/4 cup for a recipe. How many cups of oil are left?

Convert 2 1/2 to 5/2 an improper fraction equivalent then do 5/2 X 2/2 and you get 10/4. now do 10/4 - 3/4 and you get 7/4. To simplify just do 7/4 divided by 2/2

so the answer is 3.5/2 or 7/4