Mary is baking a cake. The recipe calls for 39 cups of sugar and 46 cups of flour. She already put in 14 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 39 cups of sugar and 46 cups of flour. 
3. She already put in 14 cups of sugar. 
4. How many more cups of sugar does she need to add?

To solve this problem, we need to find the difference between the amount of sugar the recipe calls for and the amount of sugar Mary has already put in. 

39 cups of sugar - 14 cups of sugar = 

25 cups of sugar