SOLUTION: How many liters of 40% solution must be added to 40 liters of 50% solution to produce a 40% solution?

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Question 25030: How many liters of 40% solution must be added to 40 liters of 50% solution to produce a 40% solution?
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
-40x+50(40)=40(40+x)
-40x+2000=1600+40x
-80x=-400
x=5

Hence about 5L of solution must be added.
Paul.