SOLUTION: How many liters of a 70% acid solution must be mixed with a 25% acid solution to get 270 L of a 60% acid solution?

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Question 965246: How many liters of a 70% acid solution must be mixed with a 25% acid solution to get 270 L of a 60% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
70X%2B25Y=0.6%28270%29
70X%2B25Y=16200
.
.
X%2BY=270
Multiply the second equation by 25 and subtract from the first.
70X%2B25Y-25X-25Y=16200-6750
45Y=9450
Y=210
Then,
X%2B210=270
X=60
.
.
60 l of 70% and 210 l of 25%