# SOLUTION: how many gallons of 20% alcohol soultion and 50% alcohol soultion must be mixed together to get 9 gallons of 30% alcohol solution?

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 Click here to see ALL problems on Mixture Word Problems Question 541136: how many gallons of 20% alcohol soultion and 50% alcohol soultion must be mixed together to get 9 gallons of 30% alcohol solution? Answer by mananth(12270)   (Show Source): You can put this solution on YOUR website!percent ---------------- quantity Alcohol I 20 ---------------- x gallons Alcohol II 50 ------ 9 - x gallons Mixture 30.00% ---------------- 9 20x+50( 9-x)=30*9 20x+450 -50x= 270 20x-50x =270-450 -30x=-180 /-30 x = 6 gallons 20.00% Alcohol I 3 gallons 50.00% Alcohol II m.ananth@hotmail.ca