SOLUTION: An acid solution was made by mixing 10 gal. of a 20% acid solution and 5 gal. of a 80% acid solution. What is the concentration of the mixture?

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Question 550769: An acid solution was made by mixing 10 gal. of a 20% acid solution and 5 gal. of a 80% acid solution. What is the concentration of the mixture?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.2%2A10+=+2+ gal of acid in 20% solution
+.8%2A5+=+4+ gal of acid in 80% solution
concentration = +%28+2+%2B+4+%29+%2F+%28+10+%2B+5+%29+ =
+6%2F15+=+2%2F5+
+2%2F5+=+40%2F100+
The concentration is 40%