SOLUTION: A chemist mixes 20% HCl with 40% HCl to make 15 liters of solution that is 25% HCl. How many liters of each does he need?

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Question 972174: A chemist mixes 20% HCl with 40% HCl to make 15 liters of solution that is 25% HCl. How many liters of each does he need?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
t = amt of 20%
f = amt of 40%
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t + f = 15 (total solution)
20t + 40f = 25*15 (total acid)