Final answer:
To calculate the water needed for one cup of rice, divide 18 cups of water by 9 cups of rice, yielding 2 cups of water per 1 cup of rice.
Step-by-step explanation:
To determine how many cups of water are needed for one cup of rice when making a batch of rice, we can use a simple proportion based on the given recipe. The recipe states that 18 cups of water are combined with 9 cups of rice. To find the amount of water needed for just one cup of rice, divide the total amount of water by the total amount of rice.
To find how many cups of water are needed for one cup of rice, we need to set up a proportion. Since 18 cups of water are combined with 9 cups of rice, we can write this as 18 cups / 9 cups = x cups / 1 cup. Cross-multiplying, we get 18 * 1 = 9 * x, which simplifies to 18 = 9x. Dividing both sides by 9, we find that x = 2. Therefore, 2 cups of water are needed for one cup of rice.
The calculation would be:
18 cups of water ÷ 9 cups of rice = 2 cups of water per 1 cup of rice.
Therefore, you need 2 cups of water to cook one cup of rice.