A chemist needs 10 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? Use 2 liters of the 50% solution.
?
A. 7 L of 10%, 7 L of 20%, 2 L of 50%
B. 1 L of 10%, 2 L of 20%, 7 L of 50%
C. 1 L of 10%, 7 L of 20%, 1 L of 50%
D. 1 L of 10%, 7 L of 20%, 2 L of 50%
E. 7 L of 10%, 1 L of 20%, 2 L of 50%
Answer: D
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