document.write( "Question 703781: how many gallons of a 60% antifreeze solution must be mixed with 90 gallons of 15% antifreeze to get a mixture that is 50% antifreeze? use the six step method \n" ); document.write( "
Algebra.Com's Answer #433691 by josgarithmetic(39617)\"\" \"About 
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What is the \"Six Step Method\"?\r
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\n" ); document.write( "\n" ); document.write( "Goal is (MainIngredient)/(TotalMixture)=0.50\r
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\n" ); document.write( "\n" ); document.write( "You do not know how much total mixture will result but you know you start with 90 gallons and that its percentage concentration is 15%, or 0.15 as fraction. You have available a higher concentration material of 60%, or 0.60 as a fraction.\r
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\n" ); document.write( "\n" ); document.write( "\"%2890%2A0.15%2Bv%2A0.60%29%2F%2890%2Bv%29=0.50\"\r
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\n" ); document.write( "\n" ); document.write( "Where the only variable, v, is the gallons of the 60% antifreeze to add.
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