You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

haley grew 16 trees in her backyard . after a typhoon 5 died . how many trees does she have left ?
11

frank had $ 16 . after buying some new toys he had $ 8 left . how much did he spend on toys ?
8

olivia picked up 16 pieces of paper from the floor . if edward picked up 3 pieces how many did they pick up total ?
19