Answer:
875 student tickets were sold.
Explanation:
Given:
The drama club sold 2100 tickets to their last play.
Student tickets were $5 and adult tickets were $7.
They collected $12,950.
Now, to find the number of student tickets sold.
Let the number student tickets be

And the number adult tickets be

So, the total number of tickets:

Now, the total amount collected:

Putting the value of
from above:



Subtracting both sides by 14700 we get:

Dividing both sides by -2 we get:

The number of student tickets = 875.
Therefore, 875 student tickets were sold.