SOLUTION: what volumes of a 2% and 5% solution must be mixed to make 250 gallons of a 2.5% solution.

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Question 963159: what volumes of a 2% and 5% solution must be mixed to make 250 gallons of a 2.5% solution.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.2X%2B5Y=%285%2F2%29%28250%29
2.X%2BY=250
Multiply eq. 2 by -2 and add to eq. 1,
2X%2B5Y-2X-2Y=625-500
3Y=125
Y=125%2F3<--- gallons of 5% solution
Then,
X%2B125%2F3=750%2F3
X=625%2F3<--- gallons of 2% solution