SOLUTION: can you show me how to do this step by step so i can use this as notes for future homework. Dmitri needs 7 liters of a 24% solution of sulfuric acid for a research project in mo

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Question 986227: can you show me how to do this step by step so i can use this as notes for future homework.
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?
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