A plank XY is resting on the ground. A load of $120\,\text{N}$ is put on it $0.50\,\text{m}$ from end X, as illustrated. End Y is then raised from the ground. The upward force required for this is $65\,\text{N}$. In the diagram, $W$ represents the weight of the plank acting through its midpoint. What is the value of $W$?
- A35 N
- B47 N
- C100 N
- D133 N