SOLUTION: A 30% solution of barium chloride is mixed with 10 L of water to form a 20% solution. How many liters of original solution did we start with?

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Question 195254: A 30% solution of barium chloride is mixed with 10 L of water to form a 20% solution. How many liters of original solution did we start with?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
A 30% solution of barium chloride is mixed with 10 L of water to form a 20% solution. How many liters of original solution did we start with?
.
Let x = amount 30% solution of barium (liters of original solution)
then
.30x = .20(10+x)
.30x = 2 + .20x
.10x = 2
x = 2/.10
x = 20 Liters