SOLUTION: A custodian is going to mix a 4% ammonia solution and a 12% ammonia solution to get 1 gallon (128 fluid ounces)of a 9% ammonia solution. How many fluid ounces of the 4% solution an

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Question 896027: A custodian is going to mix a 4% ammonia solution and a 12% ammonia solution to get 1 gallon (128 fluid ounces)of a 9% ammonia solution. How many fluid ounces of the 4% solution and the 12% solution should be used?
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