document.write( "Question 1092268: How many gallons of a 90​% antifreeze solution must be mixed with 100 gallons of 15​% antifreeze to get a mixture that is 80% ​antifreeze? Use the​ six-step method. \n" ); document.write( "
Algebra.Com's Answer #706869 by josgarithmetic(39630)\"\" \"About 
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x, how much of 90% antifreeze\r
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\n" ); document.write( "\n" ); document.write( "\"%2890x%2B15%2A100%29%2F%28x%2B100%29=80\"\r
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\n" ); document.write( "\n" ); document.write( "\"90x%2B1500=80%28x%2B100%29\"\r
\n" ); document.write( "\n" ); document.write( "\"9x%2B150=8%28x%2B100%29\"\r
\n" ); document.write( "\n" ); document.write( "\"9x%2B150=8x%2B800\"\r
\n" ); document.write( "\n" ); document.write( "\"x=800-150\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight_green%28x=650%29\", gallons of the 90% antifreeze
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