# SOLUTION: Sean wants to change 40 liters of a 60% solution of liquid hydrogen by draining off some liters and replacing them with an equal amount of a 20% solution of liquid hydrogen. If he

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 Question 463646: Sean wants to change 40 liters of a 60% solution of liquid hydrogen by draining off some liters and replacing them with an equal amount of a 20% solution of liquid hydrogen. If he wants to get a final mix of 52% of liquid hydrogen, how many liters must he drain off? Answer by robertb(4012)   (Show Source): You can put this solution on YOUR website!40*0.60 - x*0.60 + x*0.20 = 40*0.52 ==> 24 - 0.40x = 20.8 ==> -0.40x = -3.2 ==> x = 8 liters must be drained off.