document.write( "Question 1115464: Forty litres of 50% acid solution should be mixed with 20% acid solution. How much of the 20% acid solution
\n" ); document.write( "must be used so that the resulting solution contains only 40% acid?
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Algebra.Com's Answer #730332 by josgarithmetic(39618)\"\" \"About 
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x, the volume of the 20% acid material to use:
\n" ); document.write( "The volume of final blend will be \"x%2B40\"\r
\n" ); document.write( "\n" ); document.write( "\"50%2A40%2B20%2Ax=40%28x%2B40%29\"
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