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

[EX Q]: If Lawrence walked 4 kilometers at 3 kilometers per hour , how long was Lawrence walking ?
[EX A]: 1

[EX Q]: Faye had 34 coloring books . If she gave away 3 of them , but then bought 48 more , how many would she have total ?
[EX A]: 79

[EX Q]: Marilyn starts with 51 bottle caps . She shares 36 with Nancy . How many bottle caps does Marilyn end with ?
[EX A]:
15