Solve the problem.Dmitri needs 7 liters of a 15% solution of sulfuric acid for a research project in molecular biology. He has two supplies of sulfuric acid solution: one is an unlimited supply of the 7% solution and the other an unlimited supply of the 21% solution. How many liters of each solution should Dmitri use?
A. 3 L of 7% solution; 4 L of 21% solution
B. 4 L of 7% solution; 3 L of 21% solution
C. 2.5 L of 7% solution; 4.5 L of 21% solution
D. 3.5 L of 7% solution; 3.5 L of 21% solution
Answer: A
Mathematics
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