SOLUTION: Hello, One of my questions on my assignment involves a mixture problem, what would be the best way to approach it? Problem: How many quarts of water does one to add to 8 quarts

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Question 849225: Hello,
One of my questions on my assignment involves a mixture problem, what would be the best way to approach it?
Problem: How many quarts of water does one to add to 8 quarts of a 25% alcohol solution to obtain a 20% alcohol solution?
Thank you!

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
L:et +w+ = quarts of water to be added
+.25%2A8+=+2+ quarts of alcohol in 25% mixture
----------------
+2+%2F+%28+8+%2B+w+%29+=+.2+
+2+=+.2%2A%28+8+%2B+w+%29+
+2+=+1.6+%2B+.2w+
+.2w+=+.4+
+w+=+2+
2 quarts of water should be added
check:
+2+%2F+%28+8+%2B+w+%29+=+.2+
+2+%2F+%28+8+%2B+2+%29+=+.2+
+2%2F10+=+.2+
+.2+=+.2+
OK