SOLUTION: Doreen is a chemist. she needs to prepare 24 ounces of a 7% solution. Find the amount of 12% solution and the amount of a 6% solution she should mix to get this solution? Amount

Question 417064: Doreen is a chemist. she needs to prepare 24 ounces of a 7% solution. Find the amount of 12% solution and the amount of a 6% solution she should mix to get this solution?
Amount of 12%:
Amount of 6%:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ounces of 6% solution needed
Let = ounces of 12% solution needed
--------
given:
(1)
(2)
---------

(2)
Multiply both sides of (1) by
and subtract from (2)
(2)
(1)

and

She needs 20 ounces of 6% solution and
4 ounces of 12% solution
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