A chemist needs 8 liters of a 25% acid solution. The solution is to be mixed from three solutions whose concentrations are 10%, 20%, and 50%. How many liters of each solution will satisfy each condition? (a) Use 2 liters of the 50% solution. 10% solution  20% solution  (b) Use as little as possible of the 50% solution. 10% solution 20% solution  50% solution  (c) Use as much as possible of the 50% solution 10% solution 20% solution  50% solution

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