Answer:
The number of tickets sold at the gate is 
The number of tickets sold in advance is 
Step-by-step explanation:
From the question we are told that
The cost of a tickets at the gate is
The cost of a ticket in advance is
Let the number of ticket sold in the gate be G
Let the number of ticket sold in advance be A
From the question we are told that
One hundred more tickets were sold in advance than at the gate and this can be mathematically represented as

From the question we are told that
The total revenue from ticket sales was $1990 and this can be mathematically represented as

substituting for A in the equation above
=> 
Substituting this for G in the above equation
![5 [211.25] + 3A = 1990](https://tex.z-dn.net/?f=5%20%5B211.25%5D%20%20%2B%20%203A%20%20%3D%20%201990)
=> 
=> 