document.write( "Question 941550: To make low-fat cottage cheese, milk containing 4% butterfat is mixed with 12 gallons of milk containing 1% butterfat to obtain a mixture containing 2% butterfat. How many gallons of the fattier milk must be used? \n" ); document.write( "
Algebra.Com's Answer #574018 by TimothyLamb(4379)\"\" \"About 
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x = gallons of milk containing 4% butterfat
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\n" ); document.write( "0.04x + 0.01*12 = 0.02*(x + 12)
\n" ); document.write( "0.04x + 0.01*12 = 0.02x + 0.02*12
\n" ); document.write( "0.04x - 0.02x = 0.02*12 - 0.01*12
\n" ); document.write( "0.02x = 0.02*12 - 0.01*12
\n" ); document.write( "x = (0.02*12 - 0.01*12)/0.02
\n" ); document.write( "x = 6
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