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.
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Question: Context: Matthew had 31 crackers. He has 23 crackers left after he gave equal numbers of crackers to his 5 friends. 

 Question: How many crackers did Matthew give to his friends?

Answer: 8


Question: Context: Marco and his dad went strawberry picking. Marco's strawberries weighed 15 pounds. If together their strawberries weighed 37 pounds. 

 Question: How much did his dad's strawberries weigh?

Answer: 22


Question: Context: After eating a hearty meal they went to see the Buckingham palace. There, Rachel learned that 100 visitors came to the Buckingham palace on the previous day. If there were 666 visitors on that day 

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

Answer:
566