SOLUTION: If x ml pure alcohol is added to 400 ml of a 15% solution and after adding its strength becomes 32%, then the value of x is what?

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Question 549949: If x ml pure alcohol is added to 400 ml of a 15% solution and after adding its strength becomes 32%, then the value of x is what?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Alcohol in 15% solution = +.15%2A400+=+60+ ml
+%28+x+%2B+60+%29+%2F+%28+x+%2B+400+%29+=+.32+
+x+%2B+60+=+.32%2A%28+x+%2B+400+%29+
+x+%2B+60+=+.32x+%2B+128+
+.68x+=+68+
+x+=+100+
x is 100 ml
check answer:
+%28+100+%2B+60+%29+%2F+%28+100+%2B+400+%29+=+.32+
+160+%2F+500+=+.32+
+8%2F25+=+.32+
+8+=+8+
OK