Answer: He should use 14 fluid ounces of soap.
Step-by-step explanation:
1. You need to make the conversion from cups to ounces.
You know that:
Then:
2. According to the information given in the exercise, Kevin must use 4 fluid ounces of concentrated soap for every 3 cups of water or 24 fluid ounces of water.
Then, knowing that he uses 84 fluid ounces of water to make an all-purpose cleaner, you can set up the following proportion:
Where "x" is the total fluid ounces of soap that Kevin should use.
3. Solving for "x", you get this result: