SOLUTION: 8 fl.oz. of an alcohol solution was mixed with 2 fl. oz. of pure water to make a 40% alcohol solution. Find the percent concentration of the first solution

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Question 898675: 8 fl.oz. of an alcohol solution was mixed with 2 fl. oz. of pure water to make a 40% alcohol solution. Find the percent concentration of the first solution
Found 2 solutions by ewatrrr, josmiceli:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi
8p + 2(1) = .40(10)
p = 2/8 0r 25%

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = ounces of alcohol in 1st solution
+x+%2F+%28+8+%2B+2+%29+=+.4+
+x+%2F+10+=+.4+
+x+=+4+
+x%2F8+=+4%2F8+
The concentration
of the 1st solution is 50%