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.

[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 ?
[A]: 273

[Q]: if simon needs to make 519 gift bags at a rate of 42 bags per day how many days does he need to finish making all the gift boxes ?
[A]: 12.357142857142858

[Q]: her last stop was the post office . there she sent her rock collection to the geological museum in london . she was left with her 15 favorite stones after sending away a part of her collection . if she originally has 78 stones in her collection how many did she send away ?
[A]:
63