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: Baker made 155 cakes. If his friend bought 140 cakes from him 

 Question: How many cakes would baker still have?
15

Context: Jack received 3 emails in the afternoon, 5 emails in the morning and 16 emails in the evening. 

 Question: How many more emails did Jack receive in the morning than in the afternoon?

2