SOLUTION: How many litres of a 90% acid solution must be mixed with a 25% acid solution to get 250 Litres of a 80% acid solution?

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Question 655130: How many litres of a 90% acid solution must be mixed with a 25% acid solution to get 250 Litres of a 80% acid solution?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
.90x+.25(250-x)=250*.80
.90x+62.5-.25x=200
.65x=200-62.5
.65x=137.5
x=137.5/.65
x=211.54 liters of 90% acid.
250-211.54=38.46 liters of 25% acid.
Proof:
.90*211.54+.25*38.46=250*.80
190.386+9.615=200
200=200