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.
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Question: Wendy was playing a video game and had 10 lives . In a hard part of the game she lost 6 lives . If she got 37 more lives in the next level , how many lives would she have ?

Answer: 41


Question: 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 ?

Answer: 15


Question: A waiter had 33 customers to wait on . If 31 customers left and he got another 26 customers , how many customers would he have ?

Answer:
28