document.write( "Question 170410: I get really confused when trying to set these problems up. Can you help me work this one out so I can use it for my other questions please? How many liters of a 40% alcohol solution should be mixed with 40 liters of a 90% solution to get a 50% solution? Thanks for your help. \n" ); document.write( "
Algebra.Com's Answer #125808 by Mathtut(3670)\"\" \"About 
You can put this solution on YOUR website!
lets call x the number of liters for the 40% solution.\r
\n" ); document.write( "\n" ); document.write( "40%(x)+90%(40)=50%(40+x)
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\n" ); document.write( ".4x+.9(40)=.5(40+x)
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\n" ); document.write( ".4x+36=20+.5x
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\n" ); document.write( ".1x=16
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\n" ); document.write( "\"highlight%28x=160%29\"liters of 40% solution
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