instruction:
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.
question:
Tim had 50 cents . He paid 45 cents for a candy bar . How much change will he get ?
answer:
5

question:
A waiter had 6 tables he was waiting on , with 3 women and 5 men at each table . How many customers total did the waiter have ?
answer:
48

question:
While on vacation , Nancy took 49 pictures at the zoo and 8 at the museum . If she later deleted 38 of the pictures , how many pictures from her vacation did she still have ?
answer:
19