A farmer built a fence around his square plot. He used 27 fence poles on each side of the square. How many poles did he need altogether ?

Question: A farmer built a fence around his square plot. He used 27 fence poles on each side of the square. How many poles did he need altogether ?
[A].

100

[B].

104

[C].

108

[D].

None of these

Answer: Option B

Explanation:

Since each pole at the corner of the plot is common to its two sides, so we have :

Total number of poles needed = 27 x 4 – 4 = 108 – 4 = 104.