Create a ratio for making lemon juice-to-water of 1: 3. show how much lemon juice would be needed if you use 36 cups of water to make lemonade.

So if you use 1 cup of lemon juice and 3 cups of water to make lemonade then if you use 36 cups of water you will need 12 cups of lemon juice to make a lemonade.
I hope it helps you!