After eating a hearty meal they went to see the Buckingham palace. There, Rachel learned that 8 visitors came to the Buckingham palace on the previous day. If there were 23 visitors on that day How many more visitors visited the Buckingham palace on that day than on the previous day?
1. On the previous day, 8 visitors came to the Buckingham Palace. 
2. On the day Rachel learned this information, 23 visitors came to the Buckingham Palace. 
3. Therefore, 15 more visitors came to the Buckingham Palace on the day Rachel learned this information than on the previous day.