Answer:
85 adult tickets were sold.
Step-by-step explanation:
Let's let A = number of adult tickets sold and s = number of student tickets sold. Now, the number of adult tickets and student tickets sold added equal 340 tickets.
Therefore, A + s = 340
We also know that number of student tickets sold was three times the number of adult tickets sold.
Therefore, s = 3A
We can now substitute s with 3A.
A + 3A = 340
4A = 340 (Divide both sides by 4.)
A = 85
Therefore, 85 adult tickets were sold. Please mark brainliest if possible and I hope you get a good grade on your homework.