Final answer:
To find a different ratio of powder to water that would taste the same as Joe's mixture, use the ratio of 15 scoops of powder to 6 cups of water, which simplifies to 5 scoops to 2 cups.
Step-by-step explanation:
To find a different ratio of powder to water that would taste the same as Joe's mixture, we need to maintain the same ratio between the number of scoops of powder and the cups of water. Joe's ratio is 5 scoops : 2 cups. Let's find a different ratio that is equivalent to this. We can use the option C, which is 15 scoops of powder with 6 cups of water. This ratio is equivalent to Joe's ratio because when we simplify it, we get the same ratio: 5 scoops : 2 cups.