document.write( "Question 1100774: How many gallons of milk that is 3(1/2)% butterfat must be added to 80 gal of 1% butterfat milk to make milk that is 2% butterfat?
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Algebra.Com's Answer #715339 by Fombitz(32388)\"\" \"About 
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Let the amount you need to add be X.
\n" ); document.write( "\"3.5X%2B80%281%29=%28X%2B80%29%282%29\"
\n" ); document.write( "Multiply both sides by 2,
\n" ); document.write( "\"7X%2B160=4X%2B320\"
\n" ); document.write( "\"3X=160\"
\n" ); document.write( "Solve for X, the number of gallons of 3 1/2% milk.
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