6.2: Cooking Oatmeal Priya, Han, Lin, and Diego are all on a camping trip with their families. The first morning, Priya and Han make oatmeal for the group. The instructions for a large batch say, "Bring 15 cups of water to a boil, and then add 6 cups of oats."

Priya says, "The ratio of the cups of oats to the cups of water is LaTeX: 6:156:156:15. That's 0.4 cups of oats per cup of water."
Han says, "The ratio of the cups of water to the cups of oats is LaTeX: 15:615:615:6. That's 2.5 cups of water per cup of oats."

Who is correct? Explain your reasoning.

The next weekend after the camping trip, Lin and Diego each decide to cook a large batch of oatmeal to have breakfasts ready for the whole week.

Lin decides to cook 5 cups of oats. How many cups of water should she boil?
Diego boils 10 cups of water. How many cups of oats should he add into the water?
Did you use Priya's rate (0.4 cups of oats per cup of water) or Han's rate (2.5 cups of water per cup of oats) to help you answer each of the previous two questions? Why?