Minimise and Maximise `Z=5x+10y`
Subject to `x+2yle120,x+yge60,x-2yge0,yge0`.

Explanation

To solve the problem of minimizing and maximizing the objective function \( Z = 5x + 10y \) subject to the constraints, we will follow a systematic approach. Let's break it down step by step.

### Step 1: Identify the Constraints
The constraints given are:
1. \( x + 2y \leq 120 \)
2. \( x + y \geq 60 \)
3. \( x - 2y \geq 0 \)
4. \( y \geq 0 \)
...