SOLUTION: How many ounces of a 25% acid solution should be mixed with a 50% acid solution to produce 100 ounces of a 40% acid solution?

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Question 339125: How many ounces of a 25% acid solution should be mixed with a 50% acid solution to produce 100 ounces of a 40% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 25% acid solution, B the amount of 50% acid solution.
1.A%2BB=100
.
.
.
25A%2B50B=40%28100%29
25A%2B50B=4000
2.A%2B2B=160
Subtract eq. 1 from eq. 2,
A%2B2B-A-B=160-100
highlight%28B=60%29ounces
Then from eq. 1,
A%2B60=100
highlight%28A=40%29ounces