Ineed to find the area of the shaded part. i have the height of the triangle. but i dont know how to get the base of the triangle so i can figure out the area of the triangle.

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?