SOLUTION: how many fl. oz. of a 20% acid solution must be mixed with 9 fl. oz. of a 40% acid solution to make a 35% solution

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Question 937446: how many fl. oz. of a 20% acid solution must be mixed with 9 fl. oz. of a 40% acid solution to make a 35% solution
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
x = oz of 20% acid
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0.20x + 0.40*9 = 0.35*(x + 9)
0.20x + 3.6 = 0.35x + 3.15
0.35x - 0.20x = 3.6 - 3.15
0.15x = 0.45
x = 0.45/0.15
x = 3
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answer:
3 fl.oz. of 20% acid
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