SOLUTION: The chemistry lab keeps two acid solutions. One is 20% acid solutin and the other 35% acid solution. How much 20% and 35% acid solution should be used to prepare 25 liters of a 26%

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Question 348666: The chemistry lab keeps two acid solutions. One is 20% acid solutin and the other 35% acid solution. How much 20% and 35% acid solution should be used to prepare 25 liters of a 26% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 20% acid solution.
Let B be the amount of 35% acid solution.
Volume:
1.A%2BB=25
Concentration:
20A%2B35B=26%2825%29
2.4A%2B7B=130
Multiply eq. 1 by 4 and subtract from eq. 2,
4A%2B7B-4A-4B=130-100
3B=30
highlight%28+B=10%29liters
From eq. 1,
A%2B10=25
highlight%28+A=15%29liters