SOLUTION: What quantity x of a 75% acid solution must be mixed with a 25% solution to produce 500 mL of a 40% solution? Amount x=

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Question 260701: What quantity x of a 75% acid solution must be mixed with a 25% solution to produce 500 mL of a 40% solution?
Amount x=
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
x-Amount of 75% solution
y-Amount of 25% solution
1.x%2By=500
2.75x%2B25y=40%28500%29=2000
From eq. 1,
x=500-y
Substitute into eq. 2,
75x%2B25y=2000
75%28500-y%29%2B25y=20000
37500-75y%2B25y=20000
-50y=-17500
y=350
Then from eq. 1,
x=500-y
x=500-350
x=150
Use 150ml of 75% solution and 350ml of 25% solution.