It takes 2

cups of water to cook 1
cup of rice.

CLEARCHECK
How much rice can you cook with 0.5
cups of water?
cups of rice
How much water does it take to cook 6.5
cups of rice?
cups of water

For 0.5 cups of water, you can cook 0.25 cups of rice.

To cook 6.5 cups of rice, you would need 13 cups of water.