SOLUTION: A mixture of 40 liters of milk and water contains 10% water. How much water should be added to this so that water may be 20% in the new mixture?

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Question 277977: A mixture of 40 liters of milk and water contains 10% water. How much water should be added to this so that water may be 20% in the new mixture?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.1*40+x=.20(x+40)
x=5 liters
check
4+5=1/5*45=9
ok