Question 926068: A Chemist has 12 liters of a 40% acid solution. How many liters of a 15% solution should be mixed to make a 35% acid solution?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! 40*12 + 15x = 35(12 + x)
480 + 15x = 420 + 35x
20x = 60
x = 3 liters
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