TASK DEFINITION: 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.
PROBLEM: While playing at the arcade , Luke won 2 tickets playing ' whack a mole ' and 13 tickets playing ' skee ball ' . If he was trying to buy candy that cost 3 tickets a piece , how many could he buy ?

SOLUTION: 5

PROBLEM: Mark has 13 trees in his backyard . If he plants 12 more , how many trees will he have ?

SOLUTION: 25

PROBLEM: Adam had 33 books . If he sold 11 of them and used the money he earned to buy 23 new books , how many books would Adam have ?

SOLUTION:
45