After eating a hearty meal they went to see the Buckingham palace. There, Rachel learned that 92 visitors came to the Buckingham palace that day. If there were 419 visitors the previous day and 103 visitors the day before that how many visited the Buckingham palace before that day?
Let's denote the number of visitors by x. Then we have the following system of linear equations: 

x+103=419 
x+92=419-103=316 

Solving this system we get x=20. 

Therefore the answer (numeric) is: 

20