Hi,

How many liters of a 17% acid solution should be mixed with 8 liters of an 11% acid solution to obtain a mixture tha is 15%?

The idea is to algebraically show the 'mixing' 

with  amounts of total 'solution' and 'acid' on each side of an EQ

    .17x + .11*8L = .15(8L+x)

              .02x = .04*8L

                 x = 16L of the 17% solution needs to be added

and...

  = 3.6L of acid involved

 

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