A recipe that makes 4 servings calls for 2 thirds cup of flour. How much flour is required to make 20 servings?

Twenty servings is 5 times the original 4 servings, so multiply the flour by 5: 5 × 2/3 = 10/3 = 3 1/3 cups. The recipe requires 3 1/3 cups of flour, which is choice A.

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