Sally wants to bake cookies and the recipe calls for 2 1/2 cups of flour. She looks in her pantry and finds that she only has 1 1/4 cup. How much flour does Sally still need?

a. 2 1/2 + 1 1/4
b. 2 1/2 - 1 1/4
c. 2 1/2 x 1 1/4
d. 1 1/4 - 2 1/2

answer: b

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