document.write( "Question 942120: how many quarts of pure antifreeze must be added to 6 quarts of a 30% antifreeze solution to obtain a 60% antifreeze solution? \n" ); document.write( "
Algebra.Com's Answer #574284 by TimothyLamb(4379)\"\" \"About 
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x = quarts of pure antifreeze
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\n" ); document.write( "0.30*6 + 1.00x = 0.60*(x + 6)
\n" ); document.write( "0.30*6 + x = 0.60x + 0.60*6
\n" ); document.write( "x - 0.60x = 0.60*6 - 0.30*6
\n" ); document.write( "0.40x = 0.60*6 - 0.30*6
\n" ); document.write( "x = (0.60*6 - 0.30*6)/0.40
\n" ); document.write( "x = 4.5
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