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Answer:
12 250 mL containers
Explanation:
Two of the 250 mL containers will have the same volume as a half-liter container (500 mL), but at a price that is $2.58 instead of $2.89.
Holly needs to buy 12 of the 250 mL containers of water to get the lowest price.
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3 L = 3000 mL = 6(1/2 L) = 12(250 mL)