document.write( "Question 931851: How many gallons of distilled water must be mixed with
\n" ); document.write( "50 gallons of 30% alcohol solution to obtain a 25% solution?
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Algebra.Com's Answer #565862 by TimothyLamb(4379)\"\" \"About 
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x = gallons of 30% alcohol/water = 70% water/alcohol = 50 gallons
\n" ); document.write( "y = gallons of 100% water
\n" ); document.write( "z = gallons of 25% alcohol/water = 75% water/alcohol
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\n" ); document.write( "z = (x + y)
\n" ); document.write( "70x + 100y = 75z
\n" ); document.write( "70x + 100y = 75(x + y)
\n" ); document.write( "70*50 + 100y = 75(50 + y)
\n" ); document.write( "3500 + 100y = 3750 + 75y
\n" ); document.write( "25y = 250
\n" ); document.write( "y = 250/25
\n" ); document.write( "y = 10
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\n" ); document.write( "answer:
\n" ); document.write( "y = gallons of 100% water = 10
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