SOLUTION: xml of pure alcohol is added to 400ml of a 15%solution now the strength becomes 32%.what is the value of x

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Question 752132: xml of pure alcohol is added to 400ml of a 15%solution now the strength becomes 32%.what is the value of x
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.15%2A400+=+60+ ml of alcohol in 15% solution
+%28+60+%2B+x+%29+%2F+%28+400+%2B+x+%29+=+.32+
+60+%2B+x+=+.32%2A%28+400+%2B+x+%29+
+60+%2B+x+=+128+%2B+.32x+
+.68x+=+68+
+x+=+100+
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check:
+%28+60+%2B+x+%29+%2F+%28+400+%2B+x+%29+=+.32+
+%28+60+%2B+100+%29+%2F+%28+400+%2B+100+%29+=+.32+
+160+%2F+500+=+.32+
+160+=+160+
OK