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Answer:
- 7.5 oz of 12% solution
- 4.5 oz of 4% solution
Step-by-step explanation:
Let x represent the quantity of 12% solution in the mix. The the total amount of acid is ...
12%x +4%(12 -x) = 9%(12)
8x = 60 . . . . . . . . . . divide by %, subtract 48
x = 60/8 = 7.5 . . . . . ounces of 12% solution
12 -x = 4.5 . . . . . . . . ounces of 4% solution
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Additional comment
You could leave out the part about what happens to Mrs. V without changing the math problem.
