SOLUTION: fred mixed 10 ml of an acidic solution with 9 ml of a 40% acidic solution to make a 41% acidic soultion. find the percent acid concentration of the first solution

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Question 1047032: fred mixed 10 ml of an acidic solution with 9 ml of a 40% acidic solution to make a 41% acidic soultion. find the percent acid concentration of the first solution
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = % of the 1st solution needed
+%28+x%2A10+%2B+.4%2A9+%29+%2F+%28+10+%2B+9+%29+=+.41+
+10x+%2B+3.6+=+.41%2A19+
+10x+=+7.79+-+3.6+
+10x+=+4.19+
+x+=+.419+
41.9% is the acid concentration of the 1st solution
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check:
+%28+x%2A10+%2B+.4%2A9+%29+%2F+%28+10+%2B+9+%29+=+.41+
+%28+.419%2A10+%2B+.4%2A9+%29+%2F+%28+10+%2B+9+%29+=+.41+
+%28+4.19+%2B+3.6+%29+%2F+19+=+.41+
+7.79+=+.41%2A19+
+7.79+=+7.79+
OK