Mary is baking a cake. The recipe calls for 24 cups of sugar and 22 cups of flour. She already put in 22 cups of sugar. How many more cups of sugar does she need to add?
1. Mary is baking a cake. 
2. The recipe calls for 24 cups of sugar and 22 cups of flour. 
3. She already put in 22 cups of sugar. 
4. How many more cups of sugar does she need to add?

In order to solve this problem, we need to find out how many cups of sugar are left. We can do this by subtracting the number of cups of sugar she has already put in from the number of cups of sugar the recipe calls for. 

24 cups of sugar - 22 cups of sugar = 2 cups of sugar 

Therefore, Mary needs to add 2 more cups of sugar to the cake.