You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division 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: oliver won 11 tickets playing games at the arcade . if he spent 5 tickets buying a water gun how many tickets did he still have ?

Answer: 6

Question: my car gets 20 miles per gallon of gas . if grandma 's house is 100 miles away how many gallons of gas would it take to get to her house ?

Answer: 5

Question: a waiter had 14 customers . after some left he still had 3 customers . how many customers left ?

Answer:
11