document.write( "Question 608433: How many liters of a 75% acid solution must be added to 30 liters of a 15% acid solution to produce a 50% solution. \n" ); document.write( "
Algebra.Com's Answer #383188 by nerdybill(7384)\"\" \"About 
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How many liters of a 75% acid solution must be added to 30 liters of a 15% acid solution to produce a 50% solution.
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\n" ); document.write( "Let x = amount (liters) of 75% acid solution added
\n" ); document.write( "then
\n" ); document.write( ".75x + .15(30) = .50(30+x)
\n" ); document.write( ".75x + 4.5 = 15+.50x
\n" ); document.write( ".25x + 4.5 = 15
\n" ); document.write( ".25x = 10.5
\n" ); document.write( "x = 42 liters\r
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