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.

[Q]: 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 ?
[A]: 15


[Q]: Mrs. Hilt went to a concert . A total of 65899 people attended the concert . The next week , she went to a second concert , which had 119 more people in attendance . How many people were at the second concert ?
[A]: 66018


[Q]: Oscar 's bus ride to school is 0.75 mile and Charlie 's bus ride is 0.25 mile . How much longer is Oscar 's bus ride than Charlie 's ?
[A]:
0.5