SOLUTION: Set up an equation in one variable and solve it. Abner has 4 liters of a 40% solution of alcohol. How much pure alcohol must he add to have an 80% solution?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Set up an equation in one variable and solve it. Abner has 4 liters of a 40% solution of alcohol. How much pure alcohol must he add to have an 80% solution?      Log On


   

Question 357948: Set up an equation in one variable and solve it.
Abner has 4 liters of a 40% solution of alcohol. How much pure alcohol must he add to have an 80% solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 100% alcohol added.
Concentration equation:
100%28A%29%2B40%284%29=80%28A%2B4%29
100A%2B160=80A%2B320
20A=160
highlight%28A=8%29liters.