# SOLUTION: A farmer needs 120 gallons of 16% nitrogen fertilizer. He only has 12% and 22% nitrogen fertilizers to work with. How much of the 12% and 22% are needed in order to complete the mi

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 Click here to see ALL problems on Mixture Word Problems Question 356356: A farmer needs 120 gallons of 16% nitrogen fertilizer. He only has 12% and 22% nitrogen fertilizers to work with. How much of the 12% and 22% are needed in order to complete the mixture?Answer by Fombitz(13828)   (Show Source): You can put this solution on YOUR website!Let be the amount of 12% solution, the amount of 22% solution. . . Total volume equation: 1. . . Concentration equation: 2. Multiply eq. 1 by (-6) and add to eq. 2 to eliminate A and solve for B. gallons Then from eq. 1, gallons