A 128 ounce carton of milk states that there are 20 servings. How many ounces are in a serving?

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A 128 ounce carton of milk states that there are 20 servings. How many ounces are in a serving?

We divide 128 ounces by 20 servings to get ounces per serving:
128 ounces / 20 servings
6.4 ounces / serving