Mary is baking a cake. The recipe calls for 58 cups of sugar and 82 cups of flour. She already put in 450 cups of flour and 49 cups of sugar. How many more cups of sugar does she need to add?
1. Mary is baking a cake. The recipe calls for 58 cups of sugar and 82 cups of flour.
2. She already put in 450 cups of flour and 49 cups of sugar.
3. How many more cups of sugar does she need to add?

To solve this problem, we need to find out how many cups of sugar are in the recipe. We can do this by subtracting the amount of sugar Mary has already put in from the amount of sugar the recipe calls for. 

58 cups of sugar - 49 cups of sugar = 9 cups of sugar

This means that Mary needs to add 9 more cups of sugar to the cake.