Answer: 278 tickets.
Step-by-step explanation: Each ticket costs $2.25, and is sold as that constant rate. We know that the drawer ended with 775.50 and started with a minimum of $150. Using this information, we can construct an equation.
150 + 2.25x = 775.50
Using algebra, we can simplify the equation to find the answer. Whatever we do to one side must be done to both sides.
150 + 2.25x = 775.50
-150 -150
= 2.25x = 665.50
(2.25 / 2.25) x = (665.50 / 2.25)
= x = 278