SOLUTION: How much 2% acid must be mixed with 10% acid to get 500 ml of 5% acid?

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Question 340459: How much 2% acid must be mixed with 10% acid to get 500 ml of 5% acid?
Answer by Fombitz(13828) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 2% solution, B the amount of 10% solution.
1.A%2BB=500
.
.
.
2A%2B10B=5%28500%29
2A%2B10B=2500
2.A%2B5B=1250
Subtract eq. 1 from eq. 2,
A%2B5B-A-B=1250-500
4B=750
highlight%28B=375%2F2%29ml
Then from eq. 1,
A%2B375%2F2=1000%2F2
highlight%28A=625%2F2%29ml