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]: A pet supply store has 600 bags of dog food and 327 bags of cat food . How many more bags of dog food are there than cat food ?
[EX A]: 273

[EX Q]: Mary picked 122 oranges and Jason picked 105 oranges from the orange tree . How many oranges were picked in total ?
[EX A]: 227

[EX Q]: Luke made 9 dollars mowing lawns and 18 dollars weed eating . If he only spent 3 dollar a week , how long would the money last him ?
[EX A]:
9