SOLUTION: Doreen Schmidt is a chemist. She needs to prepare 24 ounces of a 7 % hydrochloric acid solution. find the amount of 12% solution and the amount of 6% solution she should mix to get

Question 445221: Doreen Schmidt is a chemist. She needs to prepare 24 ounces of a 7 % hydrochloric acid solution. find the amount of 12% solution and the amount of 6% solution she should mix to get this solution.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
percent ---------------- quantity
Acid I 12 ----------------x ounces
Acid II 6 ---------------- 24-x ounces
Total 7.00% ---------------- 24
12x+6(24-x)=7*24
12x+144-6x=168
12x-6x =168-144
6x=24
/6
x=4 ounces 12.00%
20 ounces 6.00%
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