Show that the minimum of $Z$ occurs at more than two points. Minimise and Maximise $Z = 5x + 10 y$ subject to $x + 2y \leq 120, x + y \geq 60, x – 2y \geq 0, x, y \geq 0.$

Question

     

$\begin{array}{1 1} Min = 300, Max = 600 \\ Min = 100, Max = 300 \\ Min = 300, Max = 400 \\ Min = 400, Max = 600 \end{array} $