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.

sarah bought 8 new shirts for school . if she already had 9 shirts how many did she own total ?
17

hayley had 25 meatballs on her plate . kirsten stole some of her meatballs . now she has 11 meatballs on her plate . how many meatballs did kirsten steal ?
14

lucy has an aquarium with 212 fish . she wants to buy 68 more fish . how many fish would lucy have then ?
280