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]: Ned was trying to expand his game collection . He bought 11 games from a friend and bought 22 more at a garage sale . If 19 of the games did n't work , how many good games did he end up with ?
[EX A]: 14

[EX Q]: 532 people are watching a movie in a theater . The theater has 750 seats . How many seats are empty in the theater ?
[EX A]: 218

[EX Q]: Mrs. Hilt and her sister drove to a concert 78 miles away . They drove 32 miles and then stopped for gas . Her sister put 28 gallons of gas in the car . How many miles did they have left to drive ?
[EX A]:
46