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: Mary is baking a cake. The recipe calls for 9 cups of flour and 5 cups of sugar. She already put in 3 cups of flour and 62 cups of sugar. 

 Question: How many more cups of flour does she need to add?
6

Context: Danny collects bottle caps and wrappers. He found 58 bottle caps and 25 wrappers at the park. Now he has 11 wrappers and 12 bottle caps in his collection. 

 Question: How many more bottle caps than wrappers does danny have now?
1

Context: Carol was sending out birthday invitations to her friends. Each package of invitations she bought had 10 invitations in it and she bought 7 packs. If she sends invitations to only 2 friends 

 Question: How many invitations will be left?

68