Question

A rectangular plot measuring $50$ meters by $20$ meters is to be enclosed by wire fencing. If the poles of the fence are kept $2$ meters apart. How many poles will be needed?

Answer 1

Perimeter of plot $=2(l+b)=2(50+20)=140m$

Total distance $=140m$

Distance between two poles $=2m$

Number of poles $=$ $\frac{40}{2}=70$