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.

Context: After eating a hearty meal they went to see the Buckingham palace. There were 39 paintings in the Buckingham palace. There, Rachel learned that 661 visitors came to the Buckingham palace that day. If there were 600 visitors the previous day 

 Question: How many more visitors visited the Buckingham palace on that day than on the previous day?
61

Context: A book has 3 chapters. The first chapter is 35 pages long the second chapter is 18 pages long and the third chapter is 3 pages long. 

 Question: How many more pages does the second chapter have than the third chapter?
15

Context: For Gwen's birthday she received 5 dollars from her dad. Her mom gave her 2 more dollars. If she spent 6 dollars. 

 Question: How much more money did she receive from her dad than she did from her mom?

3