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? If you are still confused, see the following example:
Context: Sam is 6 feet tall and Alex is 5 feet tall 

 Question: By how many feet is Sam taller than Alex? 
Solution: 1
Reason:  Sam's height - Alex's height = 6-5 = 1

Now, solve this instance: Context: Mary is baking a cake. The recipe calls for 9 cups of sugar 14 cups of flour and 40 cups of salt. She already put in 4 cups of flour. 

 Question: How many more cups of flour than cups of sugar does she need to add now?
Student:
1