SOLUTION: How many liters of a 10% acid solution must be mixed with 5 liters of a 25% acid solution to give a 15% solution?

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Question 462527: How many liters of a 10% acid solution must be mixed with 5 liters of a 25% acid solution to give a 15% solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.1z+.25(5)=.15(z+5)
.1z+1.25=.15z+.75
.5=.05z
z=.5/.05=10
You need 10 liters of 10% acid for your mix..