SOLUTION: Please help me, i had a hard time to answer these questions. Thank you! Here it goes, how much water must be evaporated from 18 kilograms of a 20% salt solution to produce a 50% so

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 Click here to see ALL problems on Mixture Word Problems Question 22957: Please help me, i had a hard time to answer these questions. Thank you! Here it goes, how much water must be evaporated from 18 kilograms of a 20% salt solution to produce a 50% solution?Answer by rapaljer(4667)   (Show Source): You can put this solution on YOUR website!Let x = amount of water evaporated 18 = amount of liquid before 18-x = amount of liquid after Amount of salt before = Amount of salt after .20*18= .50(18-x) 3.6 = 9.0 - .5x Subtract 9.0 from each side 3.6 - 9.0 = 9.0 - 9.0 - .5x -5.4 = -.5x Divide by -.5: x= 10.8 liters Check: .2* 18 = 3.6 before .5*(18-10.8)= .5(7.2)= 3.6 after R^2 at SCC