SOLUTION: How do I set up the question.... How much 5% acid solution and how much 10% acid solution must be mixed to make 2.5 liters of a 7% acid solution?

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Hi,

How much 5% acid solution and how much  of 10% acid solution 

must be mixed to make 2.5 liters of a 7% acid solution?

      |After multiplying thru by 100