Mary is baking a cake. The recipe calls for 36 cups of sugar and 23 cups of flour. She already put in 5 cups of sugar. How many more cups of sugar does she need to add?
1. Mary is baking a cake. The recipe calls for 36 cups of sugar and 23 cups of flour. She already put in 5 cups of sugar. How many more cups of sugar does she need to add?
2. We need to find out how many cups of sugar are left. 
3. To do that, we need to subtract 5 cups from 36 cups. 
4. 36 cups - 5 cups = 31 cups 
5. So, Mary needs to add 31 cups of sugar.