document.write( "Question 428740: How many gallons of cream that is 23% butterfat and milk that is 3% butterfat must a dairy farmer mix to make a 30 gallon mixture of milk that is 4% butterfat? \n" ); document.write( "
Algebra.Com's Answer #297942 by stanbon(75887)\"\" \"About 
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How many gallons of cream that is 23% butterfat and milk that is 3% butterfat must a dairy farmer mix to make a 30 gallon mixture of milk that is 4% butterfat?
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\n" ); document.write( "Equation:
\n" ); document.write( "fat + fat = fat
\n" ); document.write( "0.23x + 0.03(30-x) = 0.04*30
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\n" ); document.write( "Multiply thru by 100 to get:
\n" ); document.write( "23x + 3*30-3x = 4*30
\n" ); document.write( "20x = 30
\n" ); document.write( "x = 3/2 gallons (amt. of 23% cream needed)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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