SOLUTION: How many gallons of a 5% solution must be mixed with 26gallons of a 3% solution to obtain a 4% solution

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Question 462710: How many gallons of a 5% solution must be mixed with 26gallons of a 3% solution to obtain a 4% solution
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.05(z)+.03(26)=.04(z+26)
.05z+.78=.04z+1.04
.01z=.26
z=.26/.01=26
You need 26 gallons of a 3% solution for your mix..