Mary is baking a cake. The recipe calls for 9 cups of flour and 11 cups of sugar. She already put in 4 cups of flour. How many more cups of sugar than cups of flour does she need to add now?
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First, we need to figure out how many cups of sugar she has already put in. We know that she has put in 4 cups of flour, and the recipe calls for 9 cups of flour. So, we can subtract 4 from 9 to find out that she has put in 5 cups of sugar.

Now, we need to figure out how many more cups of sugar she needs to add. We know that the recipe calls for 11 cups of sugar. So, we can subtract 5 from 11 to find out that she needs to add 6 more cups of sugar.