Mary is baking a cake. The recipe calls for 7 cups of sugar and 10 cups of flour. She already put in 4 cups of sugar. How many more cups of sugar does she need to add?
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First, we need to figure out how many cups of sugar are left. We know that she started with 4 cups of sugar, and the recipe calls for 7 cups of sugar. So, we need to subtract 4 from 7.

7 - 4 = 3

That means she needs 3 more cups of sugar.