Answer: Let x be the number of shirts that David buys.
The cost of the shirts can be represented by the equation: $15x.
The total amount of money that David has spent can be represented by the equation: $32.25 + $15x.
Since David has a total of $65 to spend, we can write the inequality:
$32.25 + $15x ≤ $65
Solving for x, we get:
$15x ≤ $65 - $32.25 = $32.75
$15x ≤ $32.75
$x ≤ $32.75 / $15 = 2.183333
Since David can only buy a whole number of shirts, the maximum number of shirts that he can buy is 2.
So, the maximum number of shirts David can buy is 2.
Explanation: