document.write( "Question 901531: how many liters each of 60% acid solution and 80% acid solution must be used to produce 60 liters of 70% acid solution? \n" ); document.write( "
Algebra.Com's Answer #546809 by richwmiller(17219)\"\" \"About 
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x+y=60,
\n" ); document.write( "0.6*x+0.8*y=0.7*60
\n" ); document.write( "0.6*x+0.8*y=42
\n" ); document.write( "x=60-y
\n" ); document.write( "0.6*(60-y)+0.8*y=42
\n" ); document.write( "36-0.6y+0.8*y=42
\n" ); document.write( "0.2*y=6
\n" ); document.write( "y=30 at 80%
\n" ); document.write( "x=60-y
\n" ); document.write( "x=30 at 60%
\n" ); document.write( "check
\n" ); document.write( "0.6*30+0.8*30=0.7*60
\n" ); document.write( "18+24=42
\n" ); document.write( "42=42
\n" ); document.write( "ok
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