Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

[Q]: a dvd book holds 126 dvds . there are 81 dvds already in the book . how many more dvds can be put in the book ?
[A]: 45

[Q]: emily 's mom was buying extra school supplies for emily and her sister . she bought 13 packs of glue sticks total . if she gave emily 6 packs how many did her sister get ?
[A]: 7

[Q]: mrs. sheridan has 17 cats . mr. sheridan gave her 14 more cats . how many cats does mrs. sheridan have altogether ?
[A]:
31