document.write( "Question 815528: to produce 8 liters of a 90% alcohol solution by mixing together a 75% solution and a 95% solution how many liters of the 75% should be used \n" ); document.write( "

Algebra.Com's Answer #491031 by TimothyLamb(4379) $\"\"$ $\"About$

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w = volume of weak solution
\n" ); document.write( "s = volume of strong solution
\n" ); document.write( "---
\n" ); document.write( "75w + 95s = 8*90
\n" ); document.write( "w + s = 8
\n" ); document.write( "s = 8 - w
\n" ); document.write( "---
\n" ); document.write( "75w + 95s = 8*90
\n" ); document.write( "75w + 95s = 720
\n" ); document.write( "75w + 95(8 - w) = 720
\n" ); document.write( "75w + 760 - 95w = 720
\n" ); document.write( "20w = 40
\n" ); document.write( "---
\n" ); document.write( "w = 2 liters
\n" ); document.write( "s = 6 liters
\n" ); document.write( "---
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