SOLUTION: how much pure acid should be mixed with 4 gallons of 60% acid soultion in order to get an 80% acid solution?

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Question 306077: how much pure acid should be mixed with 4 gallons of 60% acid soultion in order to get an 80% acid solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = gallons of pure acid to add
%28x+%2B+.6%2A4%29%2F%28x+%2B+4%29+=+.8
x+%2B+2.4+=+.8%2A%28x+%2B+4%29
x+%2B+2.4+=+.8x+%2B+3.2
.2x+=+.8
x+=+4
4 gallons of pure acid must be added
check:
%284+%2B+.6%2A4%29%2F%284+%2B+4%29+=+.8
6.4%2F8+=+.8
.8+=+.8
OK