SOLUTION: How many gallons of pure alcohol should be mixed with 20 gal of a 15% alcohol solution to obtain a mixture that is 25% alcohol?

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Question 118463This question is from textbook College Algebra
: How many gallons of pure alcohol should be mixed with 20 gal of a 15% alcohol solution to obtain a mixture that is 25% alcohol? This question is from textbook College Algebra

Answer by wgunther(43) About Me  (Show Source):
You can put this solution on YOUR website!
If a 20gal solution contains 15% alcohol it contains 3 gals of alcohol. So, %283%2Bx%29%2F%2820%2Bx%29=.25. So, +3%2Bx+=+5+%2B+x%2F4+

+3x%2F4+=+2+

+x+=+8%2F3+