Solve.Dmitri needs 7 liters of a 24% 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 21% solution and the other an unlimited supply of the 28% solution. How many liters of each solution should Dmitri use?
A. 21% solution: 3 liters; 28% solution: 4 liters
B. 21% solution: 4 liters; 28% solution: 3 liters
C. 21% solution: 3.5 liters; 28% solution: 3.5 liters
D. 21% solution: 4.5 liters; 28% solution: 2.5 liters
Answer: B
Mathematics
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