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]: Elisa has 37 dollars . How many more dollars does she have to earn to have 53 dollars ?
[EX A]: 16

[EX Q]: Mary has 9 yellow marbles Joan has 3 yellow marbles . How many yellow marbles do they have in all ?
[EX A]: 12

[EX Q]: There are 41 short trees and 44 tall trees currently in the park . Park workers will plant 57 short trees today . How many short trees will the park have when the workers are finished ?
[EX A]:
98