Teacher:You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Teacher: Now, understand the problem? Solve this instance: Context: Mary is baking a cake. The recipe calls for 11 cups of sugar 6 cups of flour and 9 cups of salt. She already put in 12 cups of flour. 

 Question: How many more cups of sugar than cups of salt does she need to add now?
Student:
2