You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Q: Context: After eating a hearty meal they went to see the Buckingham palace. There, Rachel learned that 45 visitors came to the Buckingham palace on the previous day. If 829 people visited the Buckingham palace within the past 85 days 

 Question: How many visitors visited the Buckingham palace on that day?

A: 784
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Q: Context: Rachel had to complete 5 pages of math homework and 2 pages of reading homework. 

 Question: How many more pages of math homework than reading homework did she have?

A: 3
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Q: Context: Lucy went to the grocery store. She bought 23 packs of cookie and some packs of cake. In total she had 27 packs of grocery 

 Question: How many packs of cake did she buy in all?

A:
4
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