SOLUTION: how much pure acid should be mixed with 4 gallons of 50% acid solution in order to get 60% acid solution?

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Question 495789: how much pure acid should be mixed with 4 gallons of 50% acid solution in order to get 60% 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 be added
given:
+.5%2A4+=+2+ gallons of acid in 50% solution
-----------
+%28x+%2B+2%29+%2F+%28+x+%2B+4+%29+=+.6+
+x+%2B+2+=+.6%2A%28+x+%2B+4+%29+
+x+%2B+2+=+.6x+%2B+2.4+
+.4x+=+.4+
+x+=+1+
1 gallon of pure acid needs to be added
check:
+%28x+%2B+2%29+%2F+%28+x+%2B+4+%29+=+.6+
+%281+%2B+2%29+%2F+%28+1+%2B+4+%29+=+.6+
+3%2F5+=+.6+
+3+=+3+
OK