### Brain Teasers

# Nail the Square

A 27" x 27" square metal plate needs to be fixed by a carpenter on to a wooden board. The carpenter uses nails all along the edges of the square such that there are 28 nails on each side of the square. Each nail is at the same distance from the neighboring nails. How many nails does the carpenter use?

### Answer

The four corners of the square have one nail each.Each side of the square now requires 26 nails (excluding the four corners).

Thus, Total number of nails used = 4 + (4 x 26) = 108.

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