To cook 4 cups of rice, you use 8 cups of water. To cook 10 cups of rice, you use 20 cups of water. Write an expression to show how many cups of water you should use if you want c cups of rice. How many cuos of water shou you use to cook 5 cups of rice?

Water cups = 2*rice cups

10 To write an expression to show how many cups of water you should use if you want c cups of rice, we can set up a proportion based on the given information:

If 4 cups of rice require 8 cups of water, then the ratio of cups of rice to cups of water is 4:8, which simplifies to 1:2.

So, we can set up the proportion:

c cups of rice / x cups of water = 1 / 2

To solve for x (the number of cups of water needed), we cross-multiply:

2 * c = x

Therefore, the expression to show how many cups of water you should use if you want c cups of rice is:

x = 2 * c

Now, to find out how many cups of water you should use to cook 5 cups of rice, we can substitute c = 5 into the expression:

x = 2 * 5

x = 10

Therefore, you should use 10 cups of water to cook 5 cups of rice.