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.

Context: After eating a hearty meal they went to see the Buckingham palace. There, Rachel learned that 317 visitors came to the Buckingham palace that day. If there were 295 visitors the previous day 

 Question: How many more visitors visited the Buckingham palace on that day than on the previous day?
22

Context: A waiter had 14 customers. 5 customers left. 

 Question: How many customers does he still have?
9

Context: Mary is baking a cake. The recipe calls for 6 cups of sugar and 14 cups of flour. She already put in 7 cups of flour and 60 cups of sugar. 

 Question: How many more cups of flour does she need to add?

7