# SOLUTION: How many gallons of hydrochloric acid must be added to 12 gallons of a 30% solution to obtain a 40% solution?

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 Click here to see ALL problems on Mixture Word Problems Question 576777: How many gallons of hydrochloric acid must be added to 12 gallons of a 30% solution to obtain a 40% solution?Answer by chana(69)   (Show Source): You can put this solution on YOUR website!How many gallons of hydrochloric acid must be added to 12 gallons of a 30% solution to obtain a 40% solution? sol: x be the extra added solution 30% of 12 gallons = 3.6 gall. so forming the equation : ( 3.6 + x)/(12+x) = 40 / 100 solve for x you will get the required quantity which is 2 gallons