SOLUTION: please help me slove this word problem: A photographer is mixing a 5% acetic acid solution with a 10% acetic acid solution to get 5 liters of a 7% solution. How many liters of the

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Question 387048: please help me slove this word problem: A photographer is mixing a 5% acetic acid solution with a 10% acetic acid solution to get 5 liters of a 7% solution. How many liters of the 5% and 10% solutions should she add? Thank you!!
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 5% solution and B the amount of 10% solution.
1.A%2BB=5
.
.
5A%2B10B=7%285%29
2.A%2B2B=7
Subtract eq. 1 from eq. 2,
A%2B2B-A-B=7-5
highlight%28B=2%29liters
.
.
Then from eq. 1,
A%2B2=5
highlight%28A=3%29liters