SOLUTION: Hi!
Barbara has a bucket that holds 18 fl oz. She mixes 14.4 fl oz of water and 3.6 oz of ammonia to make a cleaning solution. She then decides to replace a portion of the cleanin
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Barbara has a bucket that holds 18 fl oz. She mixes 14.4 fl oz of water and 3.6 oz of ammonia to make a cleaning solution. She then decides to replace a portion of the cleanin
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Question 679432: Hi!
Barbara has a bucket that holds 18 fl oz. She mixes 14.4 fl oz of water and 3.6 oz of ammonia to make a cleaning solution. She then decides to replace a portion of the cleaning solution to create a cleaning solution with 25% ammonia. How much cleaning solution should be replaced by ammonia?
So far I have figured out that 14.4 fl oz is 80% of 18 fl oz and 3.6 fl oz is 20 % of 18 fl oz. Are the percentages part of the concentration? If not, what are they?
You can put this solution on YOUR website! The solution she has in the bucket has 80% water (as you found out), including 14.4 fl oz. water in a total of 18 fl oz. solution.
Barbara will need to add ammonia, but only after removing some ( fl oz.) of the solution she has in the bucket.
If Barbara wants an 18 fl oz. bucket full of 25% ammonia, she will need to have in that bucket fl oz. ammonia (25% ammonia) and fl oz. water (75% water).
Barbara will have to start by removing some of that 80% water solution to end up with just 13.5 fl oz. water in the bucket.
Removing fl oz. of solution, gets rid of fl oz. of water,
leaving fl oz. of water.
Since the amount of water needed is fl oz., our equation is --> --> --> --> fl oz.
