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.

[EX Q]: 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?
[EX A]: 2

[EX Q]: Context: A farmer had 105 green tomatoes and 71 red tomatoes in his garden. If he picked 137 tomatoes 

 Question: How many tomatoes are left?
[EX A]: 39

[EX Q]: Context: In a school there are 569 girls and 236 boys. 

 Question: How many more girls than boys does the school have?
[EX A]:
333