Answer:
We know that there were three large tables with an equal number of guests seated at each table. Let's represent the number of guests at each of these large tables with the variable N.
So, the total number of guests seated at the large tables is 3N.
In addition to these guests, there were 7 late arriving guests seated at a smaller table.
Therefore, the total number of guests in all is:
3N + 7
We also know that the total number of guests in all is 37. So we can set up an equation to represent this:
3N + 7 = 37
Simplifying this equation, we get:
3N = 30
Dividing both sides by 3, we get:
N = 10
So, there were 10 guests seated at each of the 3 large tables.