Step 1 :Define the objective function as \(3x + 3y\).
Step 2 :The constraints are given by the inequalities \(2x + y \geq 12\), \(x + 2y \geq 12\), and \(x, y \geq 0\).
Step 3 :Solve the linear programming problem using these constraints.
Step 4 :The minimum value of the objective function is \(\boxed{24}\).
Step 5 :The values of \(x\) and \(y\) at which this minimum occurs are both \(\boxed{4}\).