document.write( "Question 119381: \r
\n" ); document.write( "\n" ); document.write( "How much pure alcohol must be added to 40 oz of a 25%
\n" ); document.write( "solution to produce a mixture that is 40% alcohol?
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Algebra.Com's Answer #87456 by checkley71(8403)\"\" \"About 
You can put this solution on YOUR website!
.25*40+x=.4(x+40)
\n" ); document.write( "10+x=.4x+16
\n" ); document.write( "x-.4x=16-10
\n" ); document.write( ".6x=6
\n" ); document.write( "x=6/.6
\n" ); document.write( "x=10 oz of pure alcohol is needed.
\n" ); document.write( "proof
\n" ); document.write( ".25*40+10=.4*50
\n" ); document.write( "10+10=20
\n" ); document.write( "20=20
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