A public aquarium is adding coral nutrients to a large reef tank. The minimum amounts of nutrients A, B, and C that need to be added to the tank are 30 units, 16 units, and 24 units, respectively. Information about each bottle of brand X and brand Y additives is shown below. How many bottles of each brand must be added to satisfy the needs of the reef tank at the minimum possible cost?

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Cost Nutrient A Nutrient B Nutrient C 3 units 2 units 3 units 9 units 7 units 2 units Brand X $25 Brand Y $15