document.write( "Question 417853: In mixing some fuel, a scientist combines 50% ethanol solution with a 90% ethanol solution to get 40 liters 80% ethanol solution. How much of the 50% solution did the scientist use in the mixture? \n" ); document.write( "

Algebra.Com's Answer #320215 by jorel1380(3719) $\"\"$ $\"About$

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40x.8=32
\n" ); document.write( ".5m+.9(40-m)=32
\n" ); document.write( ".5m+36-.9m=32
\n" ); document.write( "4=.4m
\n" ); document.write( "4/.4=m=10
\n" ); document.write( "The scientist needs 10 liters of the 50% solution.. \n" ); document.write( "

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