document.write( "Question 620192: How many gallons of an 80% antifreeze solution must be mixed with 100 gallons of 30% antifreeze to get a mixture that is 70% antifreeze? \n" ); document.write( "
Algebra.Com's Answer #389974 by fcabanski(1391)\"\" \"About 
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The formula for a concentrated mixture is

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\n" ); document.write( "\n" ); document.write( "% times gallons (1) + % times gallons (2) / gallons (1+2) = New mixture %.

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\n" ); document.write( "\n" ); document.write( "\"%28.8x+%2B+100%2A.3%29%2F%28100+%2B+x%29+=+.7\"

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\n" ); document.write( "\n" ); document.write( ".8x + 30 = 70 + .7x


\n" ); document.write( ".1x = 40


\n" ); document.write( "x = 400
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