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?

100
104
108
None of these

Correct Answer: 104

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.

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