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.
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Question: mrs. hilt had 38 marbles . she lost 15 of them . how many marbles does she have left ?

Answer: 23

Question: mike played 6 games of basketball with his friends . if mike scored 4 points each game how many points did he score total ?

Answer: 24

Question: there were 47 bales of hay in the barn and 40 bales in the shed . benny stacked more bales in the barn today . there are now 82 bales of hay in the barn . how many bales did he store in the barn ?

Answer:
35