SOLUTION: How many liters of a 40% glycerin solution must be mixed with 10 liters of an 80% glycerin solution to obtain a 65% solution?

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Question 372630: How many liters of a 40% glycerin solution must be mixed with 10 liters of an 80% glycerin solution to obtain a 65% solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 40% solution.
40A%2B80%2810%29=65%28A%2B10%29
40A%2B800=65A%2B650
25A=150
highlight_green%28A=6%29liters