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: 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 ?

SOLUTION: 15

PROBLEM: Kelly had 56 apples . How many more apples does Kelly need to pick to have 105 apples altogether ?

SOLUTION: 49

PROBLEM: Tom has 30 violet balloons , he gave Fred 16 of the balloons . How many violet balloons does he now have ?

SOLUTION:
14