document.write( "Question 825164: I have 30 gallons of water, I need to add antifreeze to get a 60% water and 40% antifreeze mixture. How much antifreeze do I need to add? \n" ); document.write( "
Algebra.Com's Answer #497132 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "for a 40/60 antifreeze/water solution, to 30 gallons of pure water, add:
\n" ); document.write( "x = gallons of 100% antifreeze
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\n" ); document.write( "0(30) + 100x = 40(x + 30)
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\n" ); document.write( "100x = 40x + 1200
\n" ); document.write( "60x = 1200
\n" ); document.write( "x = 20
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\n" ); document.write( "answer:
\n" ); document.write( "add 20 gallons of 100% antifreeze
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