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.
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Question: Bobby has 142 books . Kristi has 78 books . How many more books does Bobby have than Kristi ?

Answer: 64


Question: Sally grew 6 carrots . Fred grew 4 carrots . How many carrots did they grow in all ?

Answer: 10


Question: There are 39 scissors and 22 pencils in the drawer . Dan placed 13 scissors in the drawer . How many scissors are now there in total ?

Answer:
52