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.

Input: Consider Input: A waiter at ' The Greasy Spoon ' restaurant had 29 customers to wait on . During the lunch rush he added another 20 customers . If 34 of the customers did n't leave him a tip , how many customers did leave a tip ?

Output: 15

Input: Consider Input: The Montoya family spends 0.6 their budget on groceries and another 0.2 going out to eat . Altogether , what fraction of their budget does the Montoya family spend on food ?

Output: 0.8

Input: Consider Input: There are 25 popular trees currently in the park . Park workers will plant 73 more popular trees today . How many popular trees will the park have when the workers are finished ?
Output: 98